CVE-2026-21901 (GCVE-0-2026-21901)
Vulnerability from cvelistv5 – Published: 2026-07-09 21:01 – Updated: 2026-07-10 14:21
VLAI
EPSS
VEX
Title
Junos OS and Junos OS Evolved: Configuration of a specific SSH option results in mgd crash
Summary
A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a specific SSH configuration parameter to create a Denial of Service (DoS).
A local high-privileged user configuring or deactivating a specific 'system services ssh' configuration parameter can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart. Continued execution of these configuration commands will create a sustained Denial of Service (DoS) condition.
This issue affects:
Junos OS:
* from 22.3 before 22.3R3-S5;
* from 22.4 before 22.4R3-S10;
* from 23.2 before 23.2R2-S7;
* from 23.4 before 23.4R2-S8.
This issue does not affect Junos OS before 22.3R1.
Junos OS Evolved:
* from 22.3R1-EVO before 23.2R2-S7-EVO;
* from 23.4 before 23.4R2-S8-EVO.
This issue does not affect Junos OS Evolved before 22.3R1-EVO.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-10 14:21 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/orangecertcc/security-research… | third-party-advisory |
| https://supportportal.juniper.net/JSA110072 | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
22.3 , < 22.3R3-S5
(custom)
Affected: 22.4 , < 22.4R3-S10 (custom) Affected: 23.2 , < 23.2R2-S7 (custom) Affected: 23.4 , < 23.4R2-S8 (custom) Unaffected: 0 , < 22.3R1 (custom) |
guessed | |
| Juniper Networks | Junos OS Evolved |
Affected:
23.2 , < 23.2R2-S7-EVO
(custom)
Affected: 23.4 , < 23.4R2-S8-EVO (custom) Unaffected: 0 , < 22.3R1-EVO (custom) |
guessed |
Date Public
2026-07-08 16:00
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"value": "A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a\u00a0specific SSH configuration parameter to create a Denial of Service (DoS).\n\nA local high-privileged user configuring or deactivating a specific \u0027system services ssh\u0027 configuration parameter\u00a0can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart.\u00a0Continued execution of these configuration commands will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects:\nJunos OS:\n\n\n * from 22.3 before 22.3R3-S5;\n * from 22.4 before 22.4R3-S10;\n * from 23.2 before 23.2R2-S7;\n * from 23.4 before 23.4R2-S8.\n\n\n\n\nThis issue does not affect Junos OS before 22.3R1.\n\n\n\nJunos OS Evolved:\n * from 22.3R1-EVO before 23.2R2-S7-EVO;\n * from 23.4 before 23.4R2-S8-EVO.\n\n\nThis issue does not affect Junos OS Evolved before 22.3R1-EVO."
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],
"id": "CVE-2026-21901",
"lastModified": "2026-08-26T17:48:51.667",
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"vulnerabilityResponseEffort": "MODERATE"
},
"source": "sirt@juniper.net",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-21901",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-10T14:21:27.704515Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-09T21:16:54.467",
"references": [
{
"source": "sirt@juniper.net",
"tags": [
"Mitigation",
"Exploit",
"Third Party Advisory"
],
"url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6"
},
{
"source": "sirt@juniper.net",
"tags": [
"Vendor Advisory"
],
"url": "https://supportportal.juniper.net/JSA110072"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"Mitigation",
"Exploit",
"Third Party Advisory"
],
"url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6"
}
],
"sourceIdentifier": "sirt@juniper.net",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"source": "sirt@juniper.net",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-21901",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-10T14:21:27.704515Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-10T14:21:20.893Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Junos OS",
"vendor": "Juniper Networks",
"versions": [
{
"lessThan": "22.3R3-S5",
"status": "affected",
"version": "22.3",
"versionType": "custom"
},
{
"lessThan": "22.4R3-S10",
"status": "affected",
"version": "22.4",
"versionType": "custom"
},
{
"lessThan": "23.2R2-S7",
"status": "affected",
"version": "23.2",
"versionType": "custom"
},
{
"lessThan": "23.4R2-S8",
"status": "affected",
"version": "23.4",
"versionType": "custom"
},
{
"lessThan": "22.3R1",
"status": "unaffected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "Junos OS Evolved",
"vendor": "Juniper Networks",
"versions": [
{
"lessThan": "23.2R2-S7-EVO",
"status": "affected",
"version": "23.2",
"versionType": "custom"
},
{
"lessThan": "23.4R2-S8-EVO",
"status": "affected",
"version": "23.4",
"versionType": "custom"
},
{
"lessThan": "22.3R1-EVO",
"status": "unaffected",
"version": "0",
"versionType": "custom"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Juniper SIRT would like to acknowledge and thank Orange CERT-CC from the Orange group for responsibly reporting this vulnerability."
}
],
"datePublic": "2026-07-08T16:00:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a\u0026nbsp;specific SSH configuration parameter to create a Denial of Service (DoS).\u003cbr\u003e\u003cbr\u003eA local high-privileged user configuring or deactivating a specific \u0027system services ssh\u0027 configuration parameter\u0026nbsp;can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart.\u0026nbsp;Continued execution of these configuration commands will create a sustained Denial of Service (DoS) condition.\u003cbr\u003e\u003cp\u003e\u003cbr\u003eThis issue affects:\u003cbr\u003eJunos OS:\u003cbr\u003e\u003c/p\u003e\u003cul\u003e\u003cli\u003efrom 22.3 before 22.3R3-S5;\u003c/li\u003e\u003cli\u003efrom 22.4 before 22.4R3-S10;\u003c/li\u003e\u003cli\u003efrom 23.2 before 23.2R2-S7;\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R2-S8.\u003c/li\u003e\u003c/ul\u003e\n\nThis issue does not affect Junos OS before 22.3R1.\n\n\u003cbr\u003e\u003cbr\u003eJunos OS Evolved:\u003cbr\u003e\u003cul\u003e\u003cli\u003efrom 22.3R1-EVO before 23.2R2-S7-EVO;\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R2-S8-EVO.\u003c/li\u003e\u003c/ul\u003eThis issue does not affect Junos OS Evolved before 22.3R1-EVO.\u003cp\u003e\u003c/p\u003e"
}
],
"value": "A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a\u00a0specific SSH configuration parameter to create a Denial of Service (DoS).\n\nA local high-privileged user configuring or deactivating a specific \u0027system services ssh\u0027 configuration parameter\u00a0can exploit a null pointer dereference in one of the functions used by SSH. The function attempts to dereference a null pointer when accessing certain configuration data, resulting in an mgd process crash and restart.\u00a0Continued execution of these configuration commands will create a sustained Denial of Service (DoS) condition.\n\nThis issue affects:\nJunos OS:\n\n\n * from 22.3 before 22.3R3-S5;\n * from 22.4 before 22.4R3-S10;\n * from 23.2 before 23.2R2-S7;\n * from 23.4 before 23.4R2-S8.\n\n\n\n\nThis issue does not affect Junos OS before 22.3R1.\n\n\n\nJunos OS Evolved:\n * from 22.3R1-EVO before 23.2R2-S7-EVO;\n * from 23.4 before 23.4R2-S8-EVO.\n\n\nThis issue does not affect Junos OS Evolved before 22.3R1-EVO."
}
],
"exploits": [
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"lang": "en",
"supportingMedia": [
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"base64": false,
"type": "text/html",
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
}
],
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 4.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
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"Recovery": "AUTOMATIC",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 6.7,
"baseSeverity": "MEDIUM",
"privilegesRequired": "HIGH",
"providerUrgency": "GREEN",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "DIFFUSE",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y/R:A/V:D/RE:M/U:Green",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "MODERATE"
},
"format": "CVSS",
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}
]
}
],
"problemTypes": [
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"descriptions": [
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"cweId": "CWE-476",
"description": "CWE-476 NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-09T21:01:31.334Z",
"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
"shortName": "juniper"
},
"references": [
{
"tags": [
"third-party-advisory"
],
"url": "https://github.com/orangecertcc/security-research/security/advisories/GHSA-g4f7-w2rc-hpj6"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://supportportal.juniper.net/JSA110072"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
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"type": "text/html",
"value": "The following software releases have been updated to resolve this specific issue:\u003cbr\u003eJunos OS: 22.3R3-S5, 22.4R3-S10, 23.2R2-S7, 23.4R2-S8, 24.2R1, and all subsequent releases.\n\u003cbr\u003e\nJunos OS Evolved: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R1-EVO, and all subsequent releases."
}
],
"value": "The following software releases have been updated to resolve this specific issue:\nJunos OS: 22.3R3-S5, 22.4R3-S10, 23.2R2-S7, 23.4R2-S8, 24.2R1, and all subsequent releases.\n\n\nJunos OS Evolved: 23.2R2-S7-EVO, 23.4R2-S8-EVO, 24.2R1-EVO, and all subsequent releases."
}
],
"source": {
"advisory": "JSA110072",
"defect": [
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],
"discovery": "EXTERNAL"
},
"title": "Junos OS and Junos OS Evolved: Configuration of a specific SSH option results in mgd crash",
"workarounds": [
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"lang": "en",
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"value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eThere are no direct workarounds for this issue.\u003cbr\u003e\u003cbr\u003e\n\n\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eOne of the following mitigations will prevent malicious exploitation:\u003c/span\u003e\u003cbr\u003e\u003cul\u003e\u003c/ul\u003e\u003cul\u003e\u003c/ul\u003e\u003cul\u003e\u003cli\u003eUse access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.\u003c/li\u003e\u003cli\u003eUtilize command authorization to limit the ability to enter config mode to trusted administrators.\u003c/li\u003e\u003c/ul\u003e\u003c/span\u003e"
}
],
"value": "There are no direct workarounds for this issue.\n\n\n\nOne of the following mitigations will prevent malicious exploitation:\n\n\n\n\n * Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.\n * Utilize command authorization to limit the ability to enter config mode to trusted administrators."
}
],
"x_generator": {
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}
},
"cveMetadata": {
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"assignerShortName": "juniper",
"cveId": "CVE-2026-21901",
"datePublished": "2026-07-09T21:01:31.334Z",
"dateReserved": "2026-01-05T17:32:48.709Z",
"dateUpdated": "2026-07-10T14:21:31.624Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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.
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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.
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