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[SECURITY] [DSA 6176-1] strongswan security update

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Debian Security Advisory DSA-6176-1                   security@debian.org
https://www.debian.org/security/                        Yves-Alexis Perez
March 23, 2026                        https://www.debian.org/security/faq
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Package        : strongswan
CVE ID         : CVE-2026-25075

Kazuma Matsumoto discovered an integer overflow bug in the EAP-TTLS plugin of
strongSwan, an IKE/IPsec suite.

The EAP-TTLS plugin doesn't check the length field in the header of
attribute-value pairs (AVPs) tunneled in EAP-TTLS, which can cause an integer
underflow that may lead to a crash. An unauthenticated attacker could exploit
this for a DoS attack by sending a crafted message.

For the oldstable distribution (bookworm), this problem has been fixed
in version 5.9.8-5+deb12u3.

For the stable distribution (trixie), this problem has been fixed in
version 6.0.1-6+deb13u4.

We recommend that you upgrade your strongswan packages.

For the detailed security status of strongswan please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/strongswan

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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[SECURITY] [DSA 6176-1] strongswan security update Yves-Alexis Perez <corsac@debian.org> - 2026-03-23 18:20 +0100

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