CVE-2011-1756 json
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attack…
published 2011-06-21 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-1755
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.7%
- EPSS 2.7% chance of exploitation in 30 days, percentile 85%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
2.66% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-399 Resource Management Errors
References
-
code.citadel.org
/cgit.cgi/git.citadel.org/commit/?id=27c991cc2059f5530d3d4e9689dc976b745f5b0c
patch
-
code.citadel.org
/cgit.cgi/git.citadel.org/commit/?id=95040add546a705cc2d1d8f16293141f9f9845a6
patch
-
security.debian.org
/debian-security/pool/updates/main/c/citadel/citadel_7.83-2squeeze2.diff.gz
patch
-
debian.org
/security/2011/dsa-2250
vendor-advisory
-
secunia.com
/advisories/44788
third-party-advisory, vendor-advisory
-
securityfocus.com
/bid/48071
vdb-entry
- packages.debian.org /changelogs/pool/main/c/citadel/citadel_7.37-8+lenny1/changelog
- packages.debian.org /changelogs/pool/main/c/citadel/citadel_7.83-2squeeze2/changelog
Sources
- CVE List CVE-2011-1756
- NVD CVE-2011-1756
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.