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.
CVSS Details
- CVSS 3.1 Base Score: 8.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade strongswan | Jan 19, 2026 | Jan 16, 2026 |
| Debian | — | Upgrade strongswan | Oct 29, 2025 | Oct 29, 2025 |
| Freebsd | — | Upgrade strongswan | Dec 10, 2025 | Oct 27, 2025 |
| Suse | — | Upgrade strongswanUpgrade strongswan-docUpgrade strongswan-mysqlUpgrade strongswan-nmUpgrade strongswan-ipsecUpgrade strongswan-hmacUpgrade strongswan-libs0Upgrade strongswan-sqlite | Dec 5, 2025 | Oct 28, 2025 |
| Ubuntu | — | Upgrade strongswanUpgrade libstrongswan | Oct 28, 2025 | Oct 27, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jan 16, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub