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CVE-2015-4485

28
FAUCET Score

CVE-2015-4485 describes a critical heap-based buffer overflow vulnerability in the libvpx library, affecting Mozilla Firefox versions prior to 40.0 and Firefox ESR 38.x before 38.2, as well as other products from Canonical, OpenSUSE, and Oracle. This flaw allows remote attackers to execute arbitrary code by enticing users to process specially crafted WebM video data. With a CVSS score of 10.0, this vulnerability is highly severe, requiring no authentication or user interaction, and leading to complete compromise of confidentiality, integrity, and availability. While no public exploit code or active exploitation is confirmed, its high FAUCET Risk Score of 87/100 and media coverage indicate significant potential risk.

Impacted Technologies

VendorProductVersion(s)CPE
<= 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:*:*:*:*:*:*:*
38.1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

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

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

Exploit Intelligence

EPSS Score
8.45%
Probability of exploitation in next 30 days
EPSS Percentile
94.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0845 is in the 91st percentile among its peer group of 51,506 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, 0.1 Mastodon, and 0.4 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-2015-4485Critical

Mozilla: Buffer overflows on Libvpx when decoding WebM video (MFSA 2015-89)

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-security-announce/2015-08/msg00021.html
lists.opensuse.org / opensuse-security-announce/2015-09/msg00016.html
lists.opensuse.org / opensuse-security-announce/2015-11/msg00025.html
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
security.gentoo.org / glsa/201605-06
mozilla.org / security/announce/2015/mfsa2015-89.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