strongSwan -- Heap-based buffer overflow in eap-mschapv2 plugin due to improper handling of failure request packets

2025-10-27 · CVE-2025-62291 · VuXML entry

Xu Biang reports: The eap-mschapv2 plugin doesn't correctly check the length of an EAP-MSCHAPv2 Failure Request packet on the client, which can cause an integer underflow that leads to a crash and, depending on the compiler options, even a heap-based buffer overflow that's potentially exploitable for remote code execution. Affected are all strongSwan versions since 4.2.12.

Affected versions

• strongswan >= 4.2.12 < 6.0.3

By system

0 still vulnerable, 1 fixed. Where VuXML applies (FreeBSD, DragonFly, FreeBSD's derivatives) a port is vulnerable while its version is in a range; pkgsrc says itself whether it lists a CVE of this advisory; OpenBSD and MidnightBSD keep no list this site reads, so their row is only an estimate: FreeBSD's ranges applied to upstream's version.