CVE-2011-1753

expat_erl.c in ejabberd before 2.1.7 and 3.x before 3.0.0-alpha-3, and exmpp before 0.9.7, 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.

Published: 2011-06-21 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-1753 is rated Moderate Risk (48.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.94%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-1753

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 2.07% 1.94% -0.13%
2 2025-03-29 1.94% 2.07% +0.13%
3 2025-03-17 — 1.94% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-1753

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2011-1753

OS Trackers for CVE-2011-1753

vendor priority summary link
debian medium CVE-2011-1753 medium priority: Debian including 1 source packages (ejabberd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-1753
gentoo normal CVE-2011-1753: 1 GLSA(s) (201206-10), 1 atom(s) (net-im/ejabberd); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2011-1753
ubuntu medium CVE-2011-1753 medium priority: Ubuntu including 1 source packages (ejabberd), 10 status rows across 10 suites (hardy, lucid, maverick, natty, oneiric, precise, quantal, raring, saucy, upstream): not-affected 5, ignored 3, released 2. https://ubuntu.com/security/CVE-2011-1753

Affected software / configurations for CVE-2011-1753

Vendor Product Version Raw CPE
process-one ejabberd <= 2.1.6 cpe:2.3:a:process-one:ejabberd:*:*:*:*:*:*:*:*
process-one ejabberd 0.9 cpe:2.3:a:process-one:ejabberd:0.9:*:*:*:*:*:*:*
process-one ejabberd 0.9.1 cpe:2.3:a:process-one:ejabberd:0.9.1:*:*:*:*:*:*:*
process-one ejabberd 0.9.8 cpe:2.3:a:process-one:ejabberd:0.9.8:*:*:*:*:*:*:*
process-one ejabberd 1.0.0 cpe:2.3:a:process-one:ejabberd:1.0.0:*:*:*:*:*:*:*
process-one ejabberd 1.1.0 cpe:2.3:a:process-one:ejabberd:1.1.0:*:*:*:*:*:*:*
process-one ejabberd 1.1.1 cpe:2.3:a:process-one:ejabberd:1.1.1:*:*:*:*:*:*:*
process-one ejabberd 1.1.1.0 cpe:2.3:a:process-one:ejabberd:1.1.1.0:*:*:*:*:*:*:*
process-one ejabberd 1.1.1.1 cpe:2.3:a:process-one:ejabberd:1.1.1.1:*:*:*:*:*:*:*
process-one ejabberd 1.1.2 cpe:2.3:a:process-one:ejabberd:1.1.2:*:*:*:*:*:*:*
process-one ejabberd 1.1.3 cpe:2.3:a:process-one:ejabberd:1.1.3:*:*:*:*:*:*:*
process-one ejabberd 1.1.14 cpe:2.3:a:process-one:ejabberd:1.1.14:*:*:*:*:*:*:*
process-one ejabberd 2.0.0 cpe:2.3:a:process-one:ejabberd:2.0.0:*:*:*:*:*:*:*
process-one ejabberd 2.0.0 cpe:2.3:a:process-one:ejabberd:2.0.0:beta1:*:*:*:*:*:*
process-one ejabberd 2.0.0 cpe:2.3:a:process-one:ejabberd:2.0.0:rc1:*:*:*:*:*:*
process-one ejabberd 2.0.1_2 cpe:2.3:a:process-one:ejabberd:2.0.1_2:*:*:*:*:*:*:*
process-one ejabberd 2.0.2 cpe:2.3:a:process-one:ejabberd:2.0.2:*:*:*:*:*:*:*
process-one ejabberd 2.0.3 cpe:2.3:a:process-one:ejabberd:2.0.3:*:*:*:*:*:*:*
process-one ejabberd 2.0.4 cpe:2.3:a:process-one:ejabberd:2.0.4:*:*:*:*:*:*:*
process-one ejabberd 2.0.5 cpe:2.3:a:process-one:ejabberd:2.0.5:*:*:*:*:*:*:*
process-one ejabberd 2.1.0 cpe:2.3:a:process-one:ejabberd:2.1.0:*:*:*:*:*:*:*
process-one ejabberd 2.1.1 cpe:2.3:a:process-one:ejabberd:2.1.1:*:*:*:*:*:*:*
process-one ejabberd 2.1.2 cpe:2.3:a:process-one:ejabberd:2.1.2:*:*:*:*:*:*:*
process-one ejabberd 2.1.3 cpe:2.3:a:process-one:ejabberd:2.1.3:*:*:*:*:*:*:*
process-one ejabberd 2.1.4 cpe:2.3:a:process-one:ejabberd:2.1.4:*:*:*:*:*:*:*
process-one ejabberd 2.1.5 cpe:2.3:a:process-one:ejabberd:2.1.5:*:*:*:*:*:*:*
process-one ejabberd 3.0.0 cpe:2.3:a:process-one:ejabberd:3.0.0:alpha1:*:*:*:*:*:*
process-one ejabberd 3.0.0 cpe:2.3:a:process-one:ejabberd:3.0.0:alpha2:*:*:*:*:*:*
process-one exmpp <= 0.9.6 cpe:2.3:a:process-one:exmpp:*:*:*:*:*:*:*:*
process-one exmpp 0.9.1 cpe:2.3:a:process-one:exmpp:0.9.1:*:*:*:*:*:*:*
process-one exmpp 0.9.2 cpe:2.3:a:process-one:exmpp:0.9.2:*:*:*:*:*:*:*
process-one exmpp 0.9.3 cpe:2.3:a:process-one:exmpp:0.9.3:*:*:*:*:*:*:*
process-one exmpp 0.9.4 cpe:2.3:a:process-one:exmpp:0.9.4:*:*:*:*:*:*:*
process-one exmpp 0.9.5 cpe:2.3:a:process-one:exmpp:0.9.5:*:*:*:*:*:*:*

References for CVE-2011-1753

cvelogic Threat Intelligence