CVE-2011-1755

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.

Published: 2011-06-20 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-1755 is rated Moderate Risk (56.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.66%). 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-2011-1755

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 2026-06-15 8.46% 3.66% -4.80%
2 2025-03-30 18.63% 8.46% -10.17%
3 2025-03-29 — 18.63% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-1755

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
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-2011-1755

OS Trackers for CVE-2011-1755

vendor priority summary link
debian medium CVE-2011-1755 medium priority: Debian including 1 source packages (jabberd2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-1755
redhat low — https://access.redhat.com/security/cve/CVE-2011-1755
ubuntu medium CVE-2011-1755 medium priority: Ubuntu including 1 source packages (jabberd2), 6 status rows across 6 suites (dapper, hardy, lucid, maverick, natty, upstream): released 5, ignored 1. https://ubuntu.com/security/CVE-2011-1755

Affected software / configurations for CVE-2011-1755

Vendor Product Version Raw CPE
jabberd2 jabberd2 < 2.2.14 cpe:2.3:a:jabberd2:jabberd2:*:*:*:*:*:*:*:*
fedoraproject fedora 13 cpe:2.3:o:fedoraproject:fedora:13:*:*:*:*:*:*:*
fedoraproject fedora 14 cpe:2.3:o:fedoraproject:fedora:14:*:*:*:*:*:*:*
fedoraproject fedora 15 cpe:2.3:o:fedoraproject:fedora:15:*:*:*:*:*:*:*
apple mac_os_x < 10.6.8 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple mac_os_x >= 10.7.0, < 10.7.2 cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
apple mac_os_x_server < 10.6.8 cpe:2.3:o:apple:mac_os_x_server:*:*:*:*:*:*:*:*
apple mac_os_x_server >= 10.7.0, < 10.7.2 cpe:2.3:o:apple:mac_os_x_server:*:*:*:*:*:*:*:*

References for CVE-2011-1755

URL Tags
http://codex.xiaoka.com/svn/jabberd2/tags/jabberd-2.2.14/ChangeLog Broken Link
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html Mailing List
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061341.html Mailing List
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061458.html Mailing List
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061482.html Mailing List
http://secunia.com/advisories/44787 Broken Link Vendor Advisory
http://secunia.com/advisories/44957 Broken Link
http://secunia.com/advisories/45112 Broken Link
http://support.apple.com/kb/HT5002 Third Party Advisory
http://www.mail-archive.com/jabberd2%40lists.xiaoka.com/msg01655.html Release Notes
http://www.redhat.com/support/errata/RHSA-2011-0881.html Broken Link
http://www.redhat.com/support/errata/RHSA-2011-0882.html Broken Link
http://www.securityfocus.com/bid/48250 Broken Link Third Party Advisory VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=700390 Issue Tracking Patch
https://exchange.xforce.ibmcloud.com/vulnerabilities/67770 Third Party Advisory VDB Entry
https://hermes.opensuse.org/messages/9197650 Broken Link
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