8.8 HIGH
- CVSS version (CVSS): 4.0
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Attack Requirement (AT): None (N)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Vulnerable System Impact Confidentiality (VC): Low (L)
- Vulnerable System Impact Integrity (VI): None (N)
- 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): None (N)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Vulnerable System Impact Confidentiality (MVC): Low (L)
- Modified Vulnerable System Impact Integrity (MVI): None (N)
- 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)
Kernel memory disclosure and denial of service in MikroTik RouterOS btest service
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)
References
-
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve third-party-advisory
-
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-… technical-description
-
https://mikrotik.com/supportsec/september-2026-vulnerability/ vendor-advisory
Affected products
- <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
-
@fabaff Fabian Affolter <mail@fabian-affolter.ch>
-
@quentinmit Quentin Smith <quentin@mit.edu>