CVE-2013-4549

QXmlSimpleReader in Qt before 5.2 allows context-dependent attackers to cause a denial of service (memory consumption) via an XML Entity Expansion (XEE) attack.

Published: 2013-12-23 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-4549 is rated Moderate Risk (48/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.10%). 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-2013-4549

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 5.22% 3.10% -2.11%
2 2025-03-30 9.51% 5.22% -4.29%
3 2025-03-29 — 9.51% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-4549

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-2013-4549

OS Trackers for CVE-2013-4549

vendor priority summary link
debian not yet assigned CVE-2013-4549 not yet assigned priority: Debian including 1 source packages (qtbase-opensource-src), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2013-4549
gentoo normal CVE-2013-4549: 1 GLSA(s) (201403-04), 1 atom(s) (dev-qt/qtcore); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-4549
redhat medium — https://access.redhat.com/security/cve/CVE-2013-4549
ubuntu medium CVE-2013-4549 medium priority: Ubuntu including 3 source packages (phantomjs, qt4-x11, qtbase-opensource-src), 51 status rows across 17 suites (artful, bionic, cosmic, disco, lucid, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): released 30, ignored 10, not-affected 5, DNE 4, needed 2. https://ubuntu.com/security/CVE-2013-4549

Affected software / configurations for CVE-2013-4549

Vendor Product Version Raw CPE
digia qt <= 5.1.0 cpe:2.3:a:digia:qt:*:*:*:*:*:*:*:*
qt qt 5.0.2 cpe:2.3:a:qt:qt:5.0.2:*:*:*:*:*:*:*

References for CVE-2013-4549

cvelogic Threat Intelligence