CVE-2025-62291
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.
CVE-2025-62291 is fixed in 26 products on 1 platform, first by DSA-6041-1, released October 27, 2025. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
8.1
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0098
62nd percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| charon-cmd · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | charon-cmd 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| charon-cmd · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | charon-cmd 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| charon-cmd · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | charon-cmd 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| charon-cmd · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | charon-cmd 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| charon-cmd · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | charon-cmd 6.0.1-6ubuntu5 | Oct 27, 2025 |
| charon-systemd · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | charon-systemd 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| charon-systemd · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | charon-systemd 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| charon-systemd · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | charon-systemd 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| charon-systemd · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | charon-systemd 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| charon-systemd · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | charon-systemd 6.0.1-6ubuntu5 | Oct 27, 2025 |
| libcharon-extauth-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | libcharon-extauth-plugins 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| libcharon-extauth-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | libcharon-extauth-plugins 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| libcharon-extauth-plugins · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | libcharon-extauth-plugins 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| libcharon-extauth-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | libcharon-extauth-plugins 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| libcharon-extauth-plugins · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | libcharon-extauth-plugins 6.0.1-6ubuntu5 | Oct 27, 2025 |
| libcharon-extra-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | libcharon-extra-plugins 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| libcharon-extra-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | libcharon-extra-plugins 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| libcharon-extra-plugins · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | libcharon-extra-plugins 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| libcharon-extra-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | libcharon-extra-plugins 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| libcharon-extra-plugins · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | libcharon-extra-plugins 6.0.1-6ubuntu5 | Oct 27, 2025 |
| libstrongswan · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | libstrongswan 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| libstrongswan · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | libstrongswan 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| libstrongswan · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | libstrongswan 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| libstrongswan · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | libstrongswan 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| libstrongswan · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | libstrongswan 6.0.1-6ubuntu5 | Oct 27, 2025 |
| libstrongswan-extra-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | libstrongswan-extra-plugins 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| libstrongswan-extra-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | libstrongswan-extra-plugins 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| libstrongswan-extra-plugins · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | libstrongswan-extra-plugins 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| libstrongswan-extra-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | libstrongswan-extra-plugins 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| libstrongswan-extra-plugins · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | libstrongswan-extra-plugins 6.0.1-6ubuntu5 | Oct 27, 2025 |
| libstrongswan-standard-plugins · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | libstrongswan-standard-plugins 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| libstrongswan-standard-plugins · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | libstrongswan-standard-plugins 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| libstrongswan-standard-plugins · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | libstrongswan-standard-plugins 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| libstrongswan-standard-plugins · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | libstrongswan-standard-plugins 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| libstrongswan-standard-plugins · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | libstrongswan-standard-plugins 6.0.1-6ubuntu5 | Oct 27, 2025 |
| perl-vici · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan · Debian 11.6 (bullseye) | 5.9.1-1+deb11u5 | DLA-4359-1 | Nov 3, 2025 |
| strongswan · Debian 12.15 (bookworm) | 5.9.8-5+deb12u2 | DSA-6041-1 | Oct 27, 2025 |
| strongswan · Debian 13.5 (trixie) | 6.0.1-6+deb13u2 | DSA-6041-1 | Oct 27, 2025 |
| strongswan · Debian 14 | 6.0.3-1 | DEBIAN-CVE-2025-62291 | Jan 16, 2026 |
| strongswan · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | strongswan 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| strongswan · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | strongswan 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| strongswan · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | strongswan 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| strongswan · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | strongswan 6.0.1-6ubuntu5 | Oct 27, 2025 |
| strongswan · opensuse-leap 15.6 | 5.9.12-150600.3.5.2 | SUSE-SU-2025:3855-1 | Oct 29, 2025 |
| strongswan · opensuse-leap 16.0 | 6.0.1-160000.3.1 | OPENSUSE-SU-2025:20132-1 | Dec 2, 2025 |
| strongswan · sles 15.6 | 5.9.12-150600.3.5.2 | SUSE-SU-2025:3855-1 | Oct 29, 2025 |
| strongswan · sles 15.7 | 5.9.14-150700.3.3.1 | SUSE-SU-2025:3834-1 | Oct 28, 2025 |
| strongswan · sles 16.0 | 6.0.1-160000.3.1 | SUSE-SU-2025:21167-1 | Dec 2, 2025 |
| strongswan-charon · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan-charon 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan-charon · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | strongswan-charon 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| strongswan-charon · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | strongswan-charon 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| strongswan-charon · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | strongswan-charon 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| strongswan-charon · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | strongswan-charon 6.0.1-6ubuntu5 | Oct 27, 2025 |
| strongswan-charon-nm · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-charon-nm-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-debugsource · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-libcharon · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan-libcharon 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan-libcharon · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | strongswan-libcharon 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| strongswan-libcharon · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | strongswan-libcharon 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| strongswan-libcharon · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | strongswan-libcharon 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| strongswan-libcharon · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | strongswan-libcharon 6.0.1-6ubuntu5 | Oct 27, 2025 |
| strongswan-libipsec · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-libipsec-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-nm · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan-nm 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan-nm · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | strongswan-nm 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| strongswan-nm · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | strongswan-nm 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| strongswan-nm · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | strongswan-nm 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| strongswan-nm · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | strongswan-nm 6.0.1-6ubuntu5 | Oct 27, 2025 |
| strongswan-pki · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan-pki 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan-pki · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | strongswan-pki 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| strongswan-pki · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | strongswan-pki 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| strongswan-pki · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | strongswan-pki 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| strongswan-pki · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | strongswan-pki 6.0.1-6ubuntu5 | Oct 27, 2025 |
| strongswan-scepclient · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan-scepclient 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan-sqlite · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-sqlite-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-starter · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan-starter 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan-starter · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | strongswan-starter 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| strongswan-starter · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | strongswan-starter 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| strongswan-starter · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | strongswan-starter 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| strongswan-starter · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | strongswan-starter 6.0.1-6ubuntu5 | Oct 27, 2025 |
| strongswan-swanctl · Ubuntu 22.04.1 LTS (jammy) | 5.9.5-2ubuntu2.4 | strongswan-swanctl 5.9.5-2ubuntu2.4 | Oct 27, 2025 |
| strongswan-swanctl · Ubuntu 24.04.5 LTS (noble) | 5.9.13-2ubuntu4.24.04.1 | strongswan-swanctl 5.9.13-2ubuntu4.24.04.1 | Oct 27, 2025 |
| strongswan-swanctl · Ubuntu 25.04 (plucky) | 5.9.13-2ubuntu4.25.04.1 | strongswan-swanctl 5.9.13-2ubuntu4.25.04.1 | Jan 16, 2026 |
| strongswan-swanctl · Ubuntu 25.10 (questing) | 6.0.1-6ubuntu4.1 | strongswan-swanctl 6.0.1-6ubuntu4.1 | Oct 27, 2025 |
| strongswan-swanctl · Ubuntu 26.04.1 LTS (resolute) | 6.0.1-6ubuntu5 | strongswan-swanctl 6.0.1-6ubuntu5 | Oct 27, 2025 |
| strongswan-tnc-imcvs · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
| strongswan-tnc-imcvs-debuginfo · Fedora 43 | 6.0.7-2.fc43 | FEDORA-2026-67A9805962 | Jun 16, 2026 |
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