CVE-2026-67279 (GCVE-0-2026-67279)
Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-05 20:40
VLAI
EPSS
VEX
Title
SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS
Summary
RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
Severity
CWE
- CWE-841 - Improper enforcement of behavioral workflow
Assigner
References
7 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 |
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "RouterOS",
"vendor": "Mikrotik",
"versions": [
{
"lessThan": "7.24.2",
"status": "affected",
"version": "7.24",
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},
{
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"status": "affected",
"version": "7.0.0",
"versionType": "custom"
},
{
"lessThan": "6.49.21",
"status": "affected",
"version": "6.0.0",
"versionType": "custom"
}
]
}
],
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"criteria": "cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.25.1",
"versionStartIncluding": "0.0.0",
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}
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"credits": [
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"type": "finder",
"value": "S\u0142awomir Rozbicki (CERT.PL)"
}
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"value": "RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.\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"
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}
],
"metrics": [
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
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"attackVector": "NETWORK",
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"subConfidentialityImpact": "NONE",
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"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
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"version": "4.0",
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"description": "CWE-841 Improper enforcement of behavioral workflow",
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"providerMetadata": {
"dateUpdated": "2026-09-05T20:40:29.029Z",
"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"shortName": "CERT-PL"
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"references": [
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"tags": [
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"url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
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"tags": [
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"url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
},
{
"tags": [
"exploit"
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"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": "SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS",
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"cveId": "CVE-2026-67279",
"datePublished": "2026-09-05T20:00:57.894Z",
"dateReserved": "2026-07-29T11:59:30.538Z",
"dateUpdated": "2026-09-05T20:40:29.029Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-67279\",\"sourceIdentifier\":\"cvd@cert.pl\",\"published\":\"2026-09-05T20:17:18.390\",\"lastModified\":\"2026-09-05T21:16:50.613\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated creation, overwrite, and reconstruction of files in the RouterOS managed file namespace, including support files containing configuration and diagnostic data.This issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)\"}],\"affected\":[{\"source\":\"cvd@cert.pl\",\"affectedData\":[{\"vendor\":\"Mikrotik\",\"product\":\"RouterOS\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"7.24\",\"lessThan\":\"7.24.2\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"7.0.0\",\"lessThan\":\"7.23.4\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6.0.0\",\"lessThan\":\"6.49.21\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/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\",\"baseScore\":6.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"LOW\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-841\"}]}],\"references\":[{\"url\":\"https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://mikrotik.com/supportsec/september-2026-vulnerability/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/\",\"source\":\"cvd@cert.pl\"}]}}"
}
}
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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.
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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.
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.
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