Vulnerability · Published Jan 16, 2026 · Assigned by mitre
CVE-2025-62291
High 8.1
In plain English
A high-severity security flaw in strongSwan from strongSwan. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)1.0%top 37.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | strongswan | 5.9.13-r2 | ALPINE-CVE-2025-62291 |
| Alpine:v3.21 | strongswan | 5.9.14-r1 | ALPINE-CVE-2025-62291 |
| Alpine:v3.22 | strongswan | 5.9.14-r1 | ALPINE-CVE-2025-62291 |
| Alpine:v3.23 | strongswan | 5.9.14-r3 | ALPINE-CVE-2025-62291 |
| Alpine:v3.24 | strongswan | 5.9.14-r3 | ALPINE-CVE-2025-62291 |
| Debian:12 | strongswan | 5.9.8-5+deb12u2 | DEBIAN-CVE-2025-62291 |
| Debian:12 | strongswan | 5.9.8-5+deb12u2 | DSA-6041-1 |
| Debian:13 | strongswan | 6.0.1-6+deb13u2 | DEBIAN-CVE-2025-62291 |
| Debian:13 | strongswan | 6.0.1-6+deb13u2 | DSA-6041-1 |
| Debian:14 | strongswan | 6.0.3-1 | DEBIAN-CVE-2025-62291 |
| Ubuntu:22.04:LTS | strongswan | 5.9.5-2ubuntu2.4 | USN-7841-1 |
| Ubuntu:22.04:LTS | strongswan | 5.9.5-2ubuntu2.4 | UBUNTU-CVE-2025-62291 |
| Ubuntu:24.04:LTS | strongswan | 5.9.13-2ubuntu4.24.04.1 | USN-7841-1 |
| Ubuntu:24.04:LTS | strongswan | 5.9.13-2ubuntu4.24.04.1 | UBUNTU-CVE-2025-62291 |
| Ubuntu:25.10 | strongswan | 6.0.1-6ubuntu4.1 | UBUNTU-CVE-2025-62291 |
| Ubuntu:25.10 | strongswan | 6.0.1-6ubuntu4.1 | USN-7841-1 |
| Ubuntu:26.04:LTS | strongswan | 6.0.1-6ubuntu5 | UBUNTU-CVE-2025-62291 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| strongSwan | strongSwan | 4.2.12 – before 6.0.3 |
Weakness: CWE-191 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H