DescriptionOpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openvpn (PTS)buster2.4.7-1+deb10u1fixed
bookworm, bookworm (security)2.6.3-1+deb12u2fixed
sid, trixie2.6.9-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
openvpnsourcewheezy(not affected)
openvpnsourcejessie(not affected)


[jessie] - openvpn <not-affected> (x509-track implemented in 2.4.0)
[wheezy] - openvpn <not-affected> (x509-track implemented in 2.4.0)
Fixed by:
In Debian openvpn is compiled against OpenSSL, thus even affected
code present.

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