CVE-2011-1756
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during...
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier 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.
Exploit likelihood
What each source reports
NVD Score used
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier 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.
- Record
CVE-2011-1756- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-399
- Updated
- 2026-11-02
CVE List No score
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier 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.
- Record
CVE-2011-1756- Updated
- 2026-11-02
EUVDEUVD-2011-1755 No score
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier 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.
- Record
EUVD-2011-1755- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6px8-r2g4-9v5v No score
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during...
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier 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.
- Record
GHSA-6px8-r2g4-9v5v- Updated
- 2026-11-02
OSVUBUNTU-CVE-2011-1756 No score
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier 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.
- Record
UBUNTU-CVE-2011-1756- Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-1756 is a medium vulnerability (CVSS 5.0) in Citadel, published May 31, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.66%, the 85th percentile. Fixed in citadel 7.83-2squeeze2.
References
code.citadel.org/cgit.cgi/git.citadel.org/commit?id=27c991cc2059f5530d3d4e9689dc976b745f5b0c
securityfocus.com/bid/48071
packages.debian.org/changelogs/pool/main/c/citadel/citadel_7.37-8+lenny1/changelog
debian.org/security/2011/dsa-2250
security.debian.org/debian-security/pool/updates/main/c/citadel/citadel_7.83-2squeeze2.diff.gz
secunia.com/advisories/44788
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nvd.nist.gov/vuln/detail/CVE-2011-1756
github.com/advisories/GHSA-6px8-r2g4-9v5v
ubuntu.com/security/CVE-2011-1756
cve.org/CVERecord?id=CVE-2011-1756