modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion…
Priority LOW 28CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
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.
Why it matters now
EPSS 0.0266 85th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:citadel:citadel:*:*:*:*:*:*:*:* | up to 7.86 | Vulnerable | Citadel |
| cpe:2.3:a:citadel:citadel:7.11:*:*:*:*:*:*:* | 7.11 | Vulnerable | Citadel |
| cpe:2.3:a:citadel:citadel:7.50:*:*:*:*:*:*:* | 7.50 | Vulnerable | Citadel |
| cpe:2.3:a:citadel:citadel:7.60:*:*:*:*:*:*:* | 7.60 | Vulnerable | Citadel |
| cpe:2.3:a:citadel:citadel:7.80:*:*:*:*:*:*:* | 7.80 | Vulnerable | Citadel |
| cpe:2.3:a:citadel:citadel:7.81:*:*:*:*:*:*:* | 7.81 | Vulnerable | Citadel |
| cpe:2.3:a:citadel:citadel:7.82:*:*:*:*:*:*:* | 7.82 | Vulnerable | Citadel |
| cpe:2.3:a:citadel:citadel:7.84:*:*:*:*:*:*:* | 7.84 | Vulnerable | Citadel |
- cpe:2.3:a:citadel:citadel:*:*:*:*:*:*:*:* Versions up to 7.86 Vulnerable ·Citadel
- cpe:2.3:a:citadel:citadel:7.11:*:*:*:*:*:*:* Versions 7.11 Vulnerable ·Citadel
- cpe:2.3:a:citadel:citadel:7.50:*:*:*:*:*:*:* Versions 7.50 Vulnerable ·Citadel
- cpe:2.3:a:citadel:citadel:7.60:*:*:*:*:*:*:* Versions 7.60 Vulnerable ·Citadel
- cpe:2.3:a:citadel:citadel:7.80:*:*:*:*:*:*:* Versions 7.80 Vulnerable ·Citadel
- cpe:2.3:a:citadel:citadel:7.81:*:*:*:*:*:*:* Versions 7.81 Vulnerable ·Citadel
- cpe:2.3:a:citadel:citadel:7.82:*:*:*:*:*:*:* Versions 7.82 Vulnerable ·Citadel
- cpe:2.3:a:citadel:citadel:7.84:*:*:*:*:*:*:* Versions 7.84 Vulnerable ·Citadel
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2011-1756
- 2026-10-03 Alias added: GHSA-6px8-r2g4-9v5v
References
Patch 3
- http://code.citadel.org/cgit.cgi/git.citadel.org/commit/?id=27c991cc2059f5530d3d4e9689dc976b745f5b0c
- http://security.debian.org/debian-security/pool/updates/main/c/citadel/citadel_7.83-2squeeze2.diff.gz
- http://code.citadel.org/cgit.cgi/git.citadel.org/commit/?id=95040add546a705cc2d1d8f16293141f9f9845a6
Advisory 1
More Citadel vulnerabilities
- TI-2023-23796 Cross-site scripting in Citadel CVSS 3.1MEDIUM 5.4
Sources
- CVE-2011-1756 · CVE Program
- CVE-2011-1756 · NVD
- FIRST EPSS
- GHSA-6px8-r2g4-9v5v · GitHub Advisory Database · CC BY 4.0
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