CVE-2026-67279 (GCVE-0-2026-67279)
Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-26 03:55Title
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
SSVC
Exploitation: active
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 00:00 UTC
CWE
- CWE-841 - Improper enforcement of behavioral workflow
Assigner
References
9 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://bishopfox.com/blog/mikrotrick-inside-the-… | third-party-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c8b1ab99-ea49-447d-b5b4-4a2c00f45887
Exploited: Yes
Timestamps
First Seen: 2026-09-25
Asserted: 2026-09-25
Scope
Notes: Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability | Affected: MikroTik / RouterOS | Description: Mikrotik RouterOS contains an improper enforcement of behavioral workflow vulnerability that could allow an unauthenticated client to open a session channel and send an exec request. This vulnerability can be chained to achieve unauthenticated exploitation of CVE-2026-86060. | 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: 2026-09-28 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://mikrotik.com/supportsec/september-2026-vulnerability/?utm_source=chatgpt.com ; ; 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-2026-67279
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-841 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | RouterOS |
| Due Date | 2026-09-28 |
| Date Added | 2026-09-25 |
| Vendorproject | MikroTik |
| Vulnerabilityname | Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-09-25 16:00 UTC
| Updated: 2026-09-25 16:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8983e1b6-6c9d-4d5e-abaf-f4462c0dbf78
Exploited: Yes
Timestamps
First Seen: 2026-09-23
Asserted: 2026-09-23
Scope
Notes: SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS | Affected: Mikrotik / RouterOS | CVSS: 6.9 (MEDIUM) | EPSS: 0.00446 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS |
| Cve Id | CVE-2026-67279 |
| Vendor | Mikrotik |
| Ghsa Id | None |
| Product | RouterOS |
| Added Date | 2026-09-23T17:08:47.607Z |
| Cvss Score | 6.9 |
| Epss Score | 0.00446 |
| Previous Ids | |
| Cvss Severity | MEDIUM |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.38167 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2026-67279 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | True |
References
Created: 2026-09-24 18:00 UTC
| Updated: 2026-09-24 18:00 UTC
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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"
}
],
"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)"
}
],
"metrics": [
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"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"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:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
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"lang": "en",
"value": "GENERAL"
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}
],
"problemTypes": [
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"descriptions": [
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"cweId": "CWE-841",
"description": "CWE-841 Improper enforcement of behavioral workflow",
"lang": "en",
"type": "CWE"
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]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-05T20:40:29.029Z",
"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"
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"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"
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"url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
},
{
"tags": [
"release-notes"
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"url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
},
{
"tags": [
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"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"
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"title": "SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS",
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},
"cveMetadata": {
"assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"assignerShortName": "CERT-PL",
"cveId": "CVE-2026-67279",
"datePublished": "2026-09-05T20:00:57.894Z",
"dateReserved": "2026-07-29T11:59:30.538Z",
"dateUpdated": "2026-09-25T15:41:23.920Z",
"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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