DescriptionInteger underflow in the DecodeGRE function in src/decode.c in Snort allows remote attackers to trigger dereferencing of certain memory locations via crafted GRE packets, which may cause corruption of log files or writing of sensitive information into log files.
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
snort (PTS)buster2.9.7.0-5fixed
buster (security)2.9.20-0+deb10u1fixed
bullseye (security)2.9.20-0+deb11u1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
snortsource(unstable)(not affected)


- snort <not-affected> (DecodeGRE function not in unstable version)
unstable contains version 2.3.3-11, and the last upstream is
This is fixed in upstream CVS so it's very likely to never affect Debian.

Search for package or bug name: Reporting problems