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CVE-2014-1581

27
FAUCET Score

CVE-2014-1581 is a use-after-free vulnerability in Mozilla Firefox and Thunderbird, specifically within the DirectionalityUtils.cpp component. This flaw allows remote attackers to execute arbitrary code by manipulating text handling during directionality resolution and layout. With a CVSS score of 7.5, it is considered highly severe due to its network-based attack vector and low attack complexity, potentially leading to partial confidentiality, integrity, and availability compromise. Despite its severity, there is no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
31.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:31.0:*:*:*:*:*:*:*
31.1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:31.1.0:*:*:*:*:*:*:*
31.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:31.0:*:*:*:*:*:*:*
31.1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:31.1.0:*:*:*:*:*:*:*
<= 32.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.98%
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 0.0398 is in the 81st percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:31.2.0-3.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:31.2.0-2.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:31.2.0-3.el6_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:31.2.0-3.el6_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:31.2.0-3.el7_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: xulrunner-0:31.2.0-1.el7_0
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2014-1581Critical

Mozilla: Use-after-free interacting with text directionality (MFSA 2014-79)

Oct 14, 2014

References

lists.fedoraproject.org / pipermail/package-announce/2014-November/141796.html
lists.fedoraproject.org / pipermail/package-announce/2014-October/141085.html
lists.opensuse.org / opensuse-security-announce/2015-01/msg00024.html
lists.opensuse.org / opensuse-security-announce/2015-07/msg00031.html
lists.opensuse.org / opensuse-updates/2014-11/msg00000.html
lists.opensuse.org / opensuse-updates/2014-11/msg00001.html
lists.opensuse.org / opensuse-updates/2014-11/msg00002.html
lists.opensuse.org / opensuse-updates/2014-11/msg00003.html
rhn.redhat.com / errata/RHSA-2014-1635.html
rhn.redhat.com / errata/RHSA-2014-1647.html
advisories.mageia.org / MGASA-2014-0421.html
bugzilla.mozilla.org / show_bug.cgi
secunia.com / advisories/61387
secunia.com / advisories/61854
secunia.com / advisories/62021
secunia.com / advisories/62022
secunia.com / advisories/62023
security.gentoo.org / glsa/201504-01
debian.org / security/2014/dsa-3050
debian.org / security/2014/dsa-3061
mozilla.org / security/announce/2014/mfsa2014-79.html
Vendor Advisory
oracle.com / technetwork/topics/security/bulletinapr2015-2511959.html
securityfocus.com / bid/70426
securitytracker.com / id/1031028
securitytracker.com / id/1031030
ubuntu.com / usn/USN-2372-1
ubuntu.com / usn/USN-2373-1