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CVE-2015-4493

26
FAUCET Score

CVE-2015-4493 is a critical heap-based buffer overflow vulnerability in the libstagefright component of Mozilla Firefox before version 40.0 and Firefox ESR 38.x before 38.2, affecting products from vendors like Canonical, Mozilla, OpenSUSE, and Oracle. This flaw, related to CVE-2015-1539, allows remote attackers to execute arbitrary code by exploiting an invalid size field in MPEG-4 video data. With a CVSS score of 9.3, it represents a severe risk due to its network attack vector, medium attack complexity, and complete compromise of confidentiality, integrity, and availability. While no public exploit code is available (Metasploit, Nuclei, ExploitDB), and it is not listed in CISA's KEV catalog, it garnered some community discussion and media coverage at the time of its disclosure.

Impacted Technologies

VendorProductVersion(s)CPE
11.3CPE matchmatch criteria
cpe:2.3:o:oracle:solaris:11.3:*:*:*:*:*:*:*
<= 39.0.3CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
38.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*
38.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:*
38.0.5CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
7.36%
Probability of exploitation in next 30 days
EPSS Percentile
93.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0736 is in the 71st percentile among its peer group of 8,920 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

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 (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:38.2.0-4.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:38.2.0-4.el6_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:38.2.0-4.el7_1
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-4493Critical

Mozilla: Overflow issues in libstagefright (MFSA 2015-83)

Aug 11, 2015

References

lists.opensuse.org / opensuse-security-announce/2015-08/msg00014.html
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2015-08/msg00015.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2015-08/msg00030.html
lists.opensuse.org / opensuse-updates/2015-08/msg00031.html
rhn.redhat.com / errata/RHSA-2015-1586.html
bugzilla.mozilla.org / show_bug.cgi
Issue Tracking
hg.mozilla.org / mozilla-central/rev/a674c7019cb5
security.gentoo.org / glsa/201605-06
debian.org / security/2015/dsa-3333
mozilla.org / security/announce/2015/mfsa2015-83.html
Vendor Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
Third Party Advisory
securitytracker.com / id/1033247
ubuntu.com / usn/USN-2702-1
Third Party Advisory
ubuntu.com / usn/USN-2702-2
Third Party Advisory
ubuntu.com / usn/USN-2702-3