CVE-2026-67277 (GCVE-0-2026-67277)
Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-11 03:55Title
Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
Summary
RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With "random-data=false", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.
This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
Severity
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 00:00 UTC
CWE
- CWE-306 - Missing authentication for critical function
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve | third-party-advisory |
| https://cert.pl/en/posts/2026/09/vulnerabilities-… | technical-description |
| https://npratley.net/reversing-mikrotiks-silent-p… | exploit |
| https://mikrotik.com/supportsec/september-2026-vu… | vendor-advisory |
| https://forum.mikrotik.com/t/6-49-21-long-term-is… | release-notes |
| https://forum.mikrotik.com/t/7-23-4-long-term-is-… | release-notes |
| https://forum.mikrotik.com/t/7-24-2-stable-is-rel… | release-notes |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: bb0ee1ae-defa-495f-8b5a-7242b86d5ccb
Exploited: Yes
Timestamps
First Seen: 2026-09-10
Asserted: 2026-09-10
Scope
Notes: MikroTik RouterOS Missing Authentication for Critical Function Vulnerability | Affected: MikroTik / RouterOS | Description: MikroTik RouterOS contains a missing authenticaion for critical function vulnerability which allows kernel memory disclosure and denial of service in the btest service. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-09-13 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://mikrotik.com/supportsec/september-2026-vulnerability/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-67277
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-306 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | RouterOS |
| Due Date | 2026-09-13 |
| Date Added | 2026-09-10 |
| Vendorproject | MikroTik |
| Vulnerabilityname | MikroTik RouterOS Missing Authentication for Critical Function Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-09-10 20:00 UTC
| Updated: 2026-09-10 20:00 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1d9ea784-c941-41ec-aa5f-c1cb172bcb68
Exploited: Yes
Timestamps
First Seen: 2026-09-05
Asserted: 2026-09-05
Scope
Notes: MikroTrick | Affected: MikroTik / RouterOS | Description: RouterOS accepts a 'related' btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With 'random-data=false', the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel. This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable) | Patched since: 2026/09/03 | Exploitation type: unknown | CWEs: CWE-306 | Origin source: CERT.PL | Notes: https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/
Evidence
Type: Csirt Report
Signal: Successful Exploitation
Confidence: 75%
Source: enisa-cnw-kev
Details
| Cwes | CWE-306 |
|---|---|
| Euvd | EUVD-2026-72025 |
| Notes | https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ |
| Catalog | ENISA / EU CSIRTs Network (CNW) KEV JSON |
| Product | RouterOS |
| Datereported | 2026/09/05 |
| Originsource | CERT.PL |
| Patchedsince | 2026/09/03 |
| Vendorproject | MikroTik |
| Exploitationtype | unknown |
| Vulnerabilityname | MikroTrick |
| Threatactorsexploiting |
References
Created: 2026-09-05 22:00 UTC
| Updated: 2026-09-05 22:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cca02293-7749-4ac4-9ec4-adceddd4aa0d
Exploited: Yes
Timestamps
First Seen: 2026-09-10
Asserted: 2026-09-10
Scope
Notes: Kernel memory disclosure and denial of service in MikroTik RouterOS btest service | Affected: Mikrotik / RouterOS | CVSS: 8.8 (HIGH) | EPSS: 0.00435 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Kernel memory disclosure and denial of service in MikroTik RouterOS btest service |
| Cve Id | CVE-2026-67277 |
| Vendor | Mikrotik |
| Ghsa Id | GHSA-6Q2X-6FHJ-R3W8 |
| Product | RouterOS |
| Added Date | 2026-09-10T19:50:56.536Z |
| Cvss Score | 8.8 |
| Epss Score | 0.00435 |
| Previous Ids | |
| Cvss Severity | HIGH |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.36743 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2026-67277 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-09-11 20:01 UTC
| Updated: 2026-09-11 20:01 UTC
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-67277",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-08T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2026-09-10",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277"
},
"type": "kev"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-11T03:55:58.675Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-09-10T00:00:00.000Z",
"value": "CVE-2026-67277 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "RouterOS",
"vendor": "Mikrotik",
"versions": [
{
"lessThan": "7.24.2",
"status": "affected",
"version": "7.24",
"versionType": "custom"
},
{
"lessThan": "7.23.4",
"status": "affected",
"version": "7.0.0",
"versionType": "custom"
},
{
"lessThan": "6.49.21",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.25.1",
"versionStartIncluding": "0.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "S\u0142awomir Rozbicki (CERT.PL)"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cdiv\u003e\u003cdiv\u003eRouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\u003c/div\u003e\u003c/div\u003e\u003cdiv\u003eThis issue was fixed in versions:\u0026nbsp;6.49.21 (Long-term),\u0026nbsp;7.23.4 (Long-term)\u0026nbsp;and\u0026nbsp;7.24.2 (Stable)\u003c/div\u003e"
}
],
"value": "RouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\n\n\n\nThis issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)"
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-306",
"description": "CWE-306 Missing authentication for critical function",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-05T20:39:44.166Z",
"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"shortName": "CERT-PL"
},
"references": [
{
"tags": [
"third-party-advisory"
],
"url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
},
{
"tags": [
"technical-description"
],
"url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
},
{
"tags": [
"exploit"
],
"url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Kernel memory disclosure and denial of service in MikroTik RouterOS btest service",
"x_generator": {
"engine": "Vulnogram 1.0.3"
}
}
},
"cveMetadata": {
"assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"assignerShortName": "CERT-PL",
"cveId": "CVE-2026-67277",
"datePublished": "2026-09-05T20:00:56.614Z",
"dateReserved": "2026-07-29T11:59:30.538Z",
"dateUpdated": "2026-09-11T03:55:58.675Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"cisa_known_exploited": {
"cveID": "CVE-2026-67277",
"cwes": [
"CWE-306"
],
"dateAdded": "2026-09-10",
"dueDate": "2026-09-13",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://mikrotik.com/supportsec/september-2026-vulnerability/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-67277",
"product": "RouterOS",
"requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
"shortDescription": "MikroTik RouterOS contains a missing authenticaion for critical function vulnerability which allows kernel memory disclosure and denial of service in the btest service.",
"vendorProject": "MikroTik",
"vulnerabilityName": "MikroTik RouterOS Missing Authentication for Critical Function Vulnerability"
},
"epss": {
"cve": "CVE-2026-67277",
"date": "2026-09-27",
"epss": "0.0156",
"percentile": "0.74237"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "RouterOS",
"vendor": "Mikrotik",
"versions": [
{
"lessThan": "7.24.2",
"status": "affected",
"version": "7.24",
"versionType": "custom"
},
{
"lessThan": "7.23.4",
"status": "affected",
"version": "7.0.0",
"versionType": "custom"
},
{
"lessThan": "6.49.21",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
}
],
"source": "cvd@cert.pl"
}
],
"cisaActionDue": "2026-09-13",
"cisaExploitAdd": "2026-09-10",
"cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
"cisaVulnerabilityName": "MikroTik RouterOS Missing Authentication for Critical Function Vulnerability",
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
"matchCriteriaId": "CFC981EC-B44C-40B5-945B-2283FADEC961",
"versionEndExcluding": "6.49.21",
"versionStartIncluding": "6.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
"matchCriteriaId": "881306AB-32B1-4B5F-96D8-9532D25F7AE4",
"versionEndExcluding": "7.23.4",
"versionStartIncluding": "7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A41D6B3C-D321-4C61-B3D5-00F8276CB4AC",
"versionEndExcluding": "7.24.2",
"versionStartIncluding": "7.24",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "RouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\n\n\n\nThis issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)"
}
],
"id": "CVE-2026-67277",
"lastModified": "2026-09-11T12:52:29.533",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 4.2,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "cvd@cert.pl",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-67277",
"options": [
{
"exploitation": "active"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-08T00:00:00+00:00",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-05T20:17:18.120",
"references": [
{
"source": "cvd@cert.pl",
"tags": [
"Third Party Advisory"
],
"url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
},
{
"source": "cvd@cert.pl",
"tags": [
"Mitigation",
"Third Party Advisory"
],
"url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
},
{
"source": "cvd@cert.pl",
"tags": [
"Release Notes"
],
"url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
},
{
"source": "cvd@cert.pl",
"tags": [
"Release Notes"
],
"url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
},
{
"source": "cvd@cert.pl",
"tags": [
"Release Notes"
],
"url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
},
{
"source": "cvd@cert.pl",
"tags": [
"Vendor Advisory"
],
"url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
},
{
"source": "cvd@cert.pl",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"US Government Resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277"
}
],
"sourceIdentifier": "cvd@cert.pl",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-306"
}
],
"source": "cvd@cert.pl",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-67277",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-10T19:48:06.780837Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2026-09-10",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277"
},
"type": "kev"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-08T15:21:17.684Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-67277"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-09-10T00:00:00.000Z",
"value": "CVE-2026-67277 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "RouterOS",
"vendor": "Mikrotik",
"versions": [
{
"lessThan": "7.24.2",
"status": "affected",
"version": "7.24",
"versionType": "custom"
},
{
"lessThan": "7.23.4",
"status": "affected",
"version": "7.0.0",
"versionType": "custom"
},
{
"lessThan": "6.49.21",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.25.1",
"versionStartIncluding": "0.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "S\u0142awomir Rozbicki (CERT.PL)"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cdiv\u003e\u003cdiv\u003eRouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\u003c/div\u003e\u003c/div\u003e\u003cdiv\u003eThis issue was fixed in versions:\u0026nbsp;6.49.21 (Long-term),\u0026nbsp;7.23.4 (Long-term)\u0026nbsp;and\u0026nbsp;7.24.2 (Stable)\u003c/div\u003e"
}
],
"value": "RouterOS accepts a \"related\" btest connection before the corresponding primary session has completed authentication. An unauthenticated client can use this state to start an IPv4 UDP test. With \"random-data=false\", the sender transmits an uninitialized tail from a kernel packet buffer. A separate unchecked, inverted packet-size interval causes unsigned integer underflow, anomalously large fragmented output, and can restart the RouterOS kernel.\n\n\n\nThis issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)"
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-306",
"description": "CWE-306 Missing authentication for critical function",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-05T20:39:44.166Z",
"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"shortName": "CERT-PL"
},
"references": [
{
"tags": [
"third-party-advisory"
],
"url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
},
{
"tags": [
"technical-description"
],
"url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
},
{
"tags": [
"exploit"
],
"url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Kernel memory disclosure and denial of service in MikroTik RouterOS btest service",
"x_generator": {
"engine": "Vulnogram 1.0.3"
}
}
},
"cveMetadata": {
"assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"assignerShortName": "CERT-PL",
"cveId": "CVE-2026-67277",
"datePublished": "2026-09-05T20:00:56.614Z",
"dateReserved": "2026-07-29T11:59:30.538Z",
"dateUpdated": "2026-09-10T19:58:23.754Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…