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CVE-2014-3660

16
FAUCET Score

CVE-2014-3660 is a denial-of-service vulnerability in libxml2 versions prior to 2.9.2, affecting products from vendors like Apple, Canonical, Debian, Red Hat, and xmlsoft. It allows attackers to cause high CPU consumption via a crafted XML document with nested entity references, a variant of the "billion laughs" attack, even when entity substitution is disabled. This vulnerability has a CVSS score of 5.0, indicating a medium severity, with a low attack complexity and no authentication required, but only impacts availability. There is no evidence of active exploitation, nor are there public exploits available in Metasploit, Nuclei, or ExploitDB, and it is not listed on the CISA KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.9.1CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*
2.0.0CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxml2:2.0.0:*:*:*:*:*:*:*
2.1.0CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxml2:2.1.0:*:*:*:*:*:*:*
2.1.1CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxml2:2.1.1:*:*:*:*:*:*:*
2.2.0CPE matchmatch criteria
cpe:2.3:a:xmlsoft:libxml2:2.2.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.99%
Probability of exploitation in next 30 days
EPSS Percentile
89.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0399 is in the 86th percentile among its peer group of 23,723 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, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

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

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: libxml2-0:2.6.26-2.1.25.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libxml2-0:2.7.6-17.el6_6.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libxml2-0:2.9.1-5.el7_0.1
View patch
applevendor investigatingvia nvd_reference
View patch
ubuntuvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2014-3660Moderate

libxml2: denial of service via recursive entity expansion

Oct 16, 2014

References

kb.juniper.net / InfoCenter/index
lists.apple.com / archives/security-announce/2015/Aug/msg00001.html
lists.apple.com / archives/security-announce/2015/Aug/msg00002.html
lists.opensuse.org / opensuse-updates/2014-10/msg00034.html
lists.opensuse.org / opensuse-updates/2015-12/msg00120.html
rhn.redhat.com / errata/RHSA-2014-1655.html
rhn.redhat.com / errata/RHSA-2014-1885.html
bugzilla.redhat.com / attachment.cgi
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/59903
secunia.com / advisories/61965
secunia.com / advisories/61966
secunia.com / advisories/61991
support.apple.com / kb/HT205030
Vendor Advisory
support.apple.com / kb/HT205031
Vendor Advisory
ncsc.nl / actueel/nieuwsberichten/kwetsbaarheid-ontdekt-in-libxml2.html
debian.org / security/2014/dsa-3057
mandriva.com / security/advisories
openwall.com / lists/oss-security/2014/10/17/7
Patch
oracle.com / technetwork/topics/security/bulletinjan2015-2370101.html
oracle.com / technetwork/topics/security/ovmbulletinjul2016-3090546.html
securityfocus.com / bid/70644
ubuntu.com / usn/USN-2389-1
Vendor Advisory