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CVE-2026-86060
9.2 CRITICAL
- CVSS version (CVSS): 4.0
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Attack Requirement (AT): Present (P)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Vulnerable System Impact Confidentiality (VC): High (H)
- Vulnerable System Impact Integrity (VI): High (H)
- Vulnerable System Impact Availability (VA): High (H)
- Subsequent System Impact Confidentiality (SC): None (N)
- Subsequent System Impact Integrity (SI): None (N)
- Subsequent System Impact Availability (SA): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Attack Requirement (MAT): Present (P)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Vulnerable System Impact Confidentiality (MVC): High (H)
- Modified Vulnerable System Impact Integrity (MVI): High (H)
- Modified Vulnerable System Impact Availability (MVA): High (H)
- Modified Subsequent System Impact Confidentiality (MSC): Negligible (N)
- Modified Subsequent System Impact Integrity (MSI): Negligible (N)
- Modified Subsequent System Impact Availability (MSA): Negligible (N)
- Safety (S): Not Defined (X)
- Automatable (AU): Not Defined (X)
- Recovery (R): Not Defined (X)
- Value Density (V): Not Defined (X)
- Vulnerability Response Effort (RE): Not Defined (X)
- Provider Urgency (U): Not Defined (X)
- Confidentiality Req. (CR): Not Defined (X)
- Integrity Req. (IR): Not Defined (X)
- Availability Req. (AR): Not Defined (X)
- Exploit Maturity (E): Not Defined (X)
by @LeSuisse Activity log
- Created suggestion
- @LeSuisse dismissed (not in Nixpkgs)
SSH session privilege manipulation via a crafted username in Mikrotik RouterOS
RouterOS contains an argument-handling flaw in the SSH login path involving usernames that begin with a prohibited character, allowing for the trusted RouterOS policy mask to be changed, leading to privilege escalation. Exploitation requires an unauthenticated SSH session to reach the RouterOS login helper.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
References
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https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve third-party-advisory
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https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-… technical-description
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https://mikrotik.com/supportsec/september-2026-vulnerability/ vendor-advisory
Affected products
RouterOS
- <7.23.4
- <6.49.21
- <7.24.2
Matching in nixpkgs
pkgs.terraform-providers.routeros
None
pkgs.python313Packages.librouteros
Python implementation of the MikroTik RouterOS API
pkgs.python314Packages.librouteros
Python implementation of the MikroTik RouterOS API
pkgs.python313Packages.routeros-api
Python API to RouterBoard devices produced by MikroTik
pkgs.python314Packages.routeros-api
Python API to RouterBoard devices produced by MikroTik
Package maintainers
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@fabaff Fabian Affolter <mail@fabian-affolter.ch>
-
@quentinmit Quentin Smith <quentin@mit.edu>