CVE-2025-62291
Publication date 27 October 2025
Last updated 21 January 2026
Ubuntu priority
Description
In the eap-mschapv2 plugin (client-side) in strongSwan before 6.0.3, a malicious EAP-MSCHAPv2 server can send a crafted message of size 6 through 8, and cause an integer underflow that potentially results in a heap-based buffer overflow.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| strongswan | 25.10 questing |
Fixed 6.0.1-6ubuntu4.1
|
| 24.04 LTS noble |
Fixed 5.9.13-2ubuntu4.24.04.1
|
|
| 22.04 LTS jammy |
Fixed 5.9.5-2ubuntu2.4
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.1 · High
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-7841-1
- strongSwan vulnerability
- 27 October 2025