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CVE-2013-4520

14
FAUCET Score

CVE-2013-4520 is a denial-of-service vulnerability affecting libxslt versions prior to 1.1.25, specifically within the xslt.c component. It allows remote attackers to crash the application by providing a malicious stylesheet embedding a DTD, leading to incorrect memory access. Rated with a CVSS score of 4.3 (AV:N/AC:M/Au:N/C:N/I:N/A:P), this vulnerability has a network attack vector, medium complexity, and a potential impact of partial availability loss. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.1.24CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxslt:*:*:*:*:*:*:*:*
0.0.1CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxslt:0.0.1:*:*:*:*:*:*:*
0.1.0CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxslt:0.1.0:*:*:*:*:*:*:*
0.2.0CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxslt:0.2.0:*:*:*:*:*:*:*
0.3.0CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxslt:0.3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.29%
Probability of exploitation in next 30 days
EPSS Percentile
81.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0229 is in the 70th percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: libxslt

Vendor Advisories (1)

redhatCVE-2013-4520Moderate

libxslt: DoS when reading unexpected DTD nodes in XSLT in versions prior to 1.1.25

Sep 16, 2009

References

bugzilla.novell.com / show_bug.cgi
ExploitPatch
seclists.org / oss-sec/2013/q4/238
Patch
seclists.org / oss-sec/2013/q4/239
Patch
secunia.com / advisories/56072
Vendor Advisory
gitorious.org / libxslt/libxslt/commit/7089a62b8f133b42a2981cf1f920a8b3fe9a8caa
ExploitPatch
suse.com / support/update/announcement/2013/suse-su-20131654-1.html
suse.com / support/update/announcement/2013/suse-su-20131656-1.html
osvdb.org / 99671