CVE-2011-1756

Name: CVE-2011-1756
Creator: NVD / NIST
Published: 2011-06-21T02:52:43.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.66%

Last modified Jun 16, 2026

CVE-2011-1756 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.66% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

2.66%

83.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Citadel	Citadel	<= 7.86
Citadel	Citadel	7.11
Citadel	Citadel	7.50
Citadel	Citadel	7.60
Citadel	Citadel	7.80
Citadel	Citadel	7.81
Citadel	Citadel	7.82
Citadel	Citadel	7.84

References

Timeline

Published: Jun 21, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-1756?

How severe is CVE-2011-1756?

Severity scoring for CVE-2011-1756 is pending analysis. The EPSS model estimates a 2.66% probability of exploitation in the next 30 days.

How do I fix CVE-2011-1756?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2011-1756?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST