DescriptionThe Edge Side Includes (ESI) parser in Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not check buffer limits during XML parsing, which allows remote HTTP servers to cause a denial of service (assertion failure and daemon exit) via a crafted XML document, related to esi/ and esi/CustomParser.h.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs816011

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
squid (PTS)wheezy2.7.STABLE9-4.1+deb7u1fixed
wheezy (security)2.7.STABLE9-4.1+deb7u3fixed
squid3 (PTS)wheezy3.1.20-2.2+deb7u4vulnerable
wheezy (security)3.1.20-2.2+deb7u8vulnerable
jessie (security)3.4.8-6+deb8u5vulnerable
stretch (security), stretch3.5.23-5+deb9u1fixed
buster, sid3.5.27-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
squidsource(unstable)(not affected)


[jessie] - squid3 <no-dsa> (Minor issue, needs substantial backporting; too intrusive to backport)
[wheezy] - squid3 <no-dsa> (Minor issue, needs substantial backporting; too intrusive to backport)
- squid <not-affected> (Vulnerable code not present)
Upstream confirmed it does not affect squid 2.7.x
It's maybe too instrusive to fix in 3.1 (squeeze and wheezy).

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