What’s Vulnerable › Vulnerabilities

CVE-2011-1755

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-06-21 · updated 2026-06-16
• Weakness: CWE-776

Description

jabberd2 before 2.2.14 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

• macOS: before 10.6.8; from 10.7.0 before 10.7.2 — fixed in 10.6.8, 10.7.2
• Apple Mac Os X Server: before 10.6.8; from 10.7.0 before 10.7.2 — fixed in 10.6.8, 10.7.2
• Fedoraproject Fedora: 13, 14, 15
• Jabberd2: before 2.2.14 — fixed in 2.2.14

How to fix

Upgrade to a fixed version: macOS 10.6.8, 10.7.2; Apple Mac Os X Server 10.6.8, 10.7.2; Jabberd2 2.2.14. Check the vendor advisory for mitigations.

References

• http://codex.xiaoka.com/svn/jabberd2/tags/jabberd-2.2.14/ChangeLog
• http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
• http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061341.html
• http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061458.html
• http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061482.html
• http://secunia.com/advisories/44787
• http://secunia.com/advisories/44957
• http://secunia.com/advisories/45112
• http://support.apple.com/kb/HT5002
• http://www.mail-archive.com/jabberd2%40lists.xiaoka.com/msg01655.html
• http://www.redhat.com/support/errata/RHSA-2011-0881.html
• http://www.redhat.com/support/errata/RHSA-2011-0882.html

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