CVE-2011-1753: Process-One Ejabberd

Medium severity, CVSS 5.0. EPSS: 2.1% chance of exploitation in the next 30 days.

expat_erl.c in ejabberd before 2.1.7 and 3.x before 3.0.0-alpha-3, and exmpp before 0.9.7, does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.

Affected products

• Process-One Ejabberd: up to and including 2.1.6; version 0.9 only; version 0.9.1 only; version 0.9.8 only; version 1.0.0 only; version 1.1.0 only; …
• Process-One Exmpp: up to and including 0.9.6; version 0.9.1 only; version 0.9.2 only; version 0.9.3 only; version 0.9.4 only; version 0.9.5 only

Published 2011-06-21. Last modified 2026-06-16.