CVE-2015-4479

CVE-2015-4479 is a critical-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

• Severity: Critical (CVSS 2.0 base score 10.0)
• EPSS exploit prediction: 9% (95th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-189
• Affected product: Mozilla Firefox
• Published: 2015-08-16
• Last modified: 2026-06-17

Description

Multiple integer overflows in libstagefright in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 allow remote attackers to execute arbitrary code via a crafted saio chunk in MPEG-4 video data.

Frequently asked questions

What is CVE-2015-4479?

Multiple integer overflows in libstagefright in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 allow remote attackers to execute arbitrary code via a crafted saio chunk in MPEG-4 video data.

How severe is CVE-2015-4479?

CVE-2015-4479 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2015-4479 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-4479?

CVE-2015-4479 primarily affects Mozilla Firefox. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-4479?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2015-4479 published?

CVE-2015-4479 was published on 2015-08-16 and last updated on 2026-06-17.

References

• http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html
• http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html
• http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html
• http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016.html
• http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00025.html
• http://lists.opensuse.org/opensuse-updates/2015-08/msg00030.html
• http://lists.opensuse.org/opensuse-updates/2015-08/msg00031.html
• http://rhn.redhat.com/errata/RHSA-2015-1586.html
• http://www.debian.org/security/2015/dsa-3333
• http://www.mozilla.org/security/announce/2015/mfsa2015-83.html
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securitytracker.com/id/1033247
• http://www.ubuntu.com/usn/USN-2702-1
• http://www.ubuntu.com/usn/USN-2702-2
• http://www.ubuntu.com/usn/USN-2702-3
• http://www.zerodayinitiative.com/advisories/ZDI-15-456
• https://bugzilla.mozilla.org/show_bug.cgi?id=1170344
• https://bugzilla.mozilla.org/show_bug.cgi?id=1185115
• https://security.gentoo.org/glsa/201605-06

Affected products (10)

• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
• cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
• cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

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Other CWE-189 (Numeric Errors) vulnerabilities

• CVE-2015-8396 — Critical (CVSS 10.0): Integer overflow in the ImageRegionReader::ReadIntoBuffer function in…
• CVE-2015-7205 — Critical (CVSS 10.0): Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x…
• CVE-2015-6575 — Critical (CVSS 10.0): SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I does not properly consider integer promotion, which…
• CVE-2015-3864 — Critical (CVSS 10.0): Integer underflow in the MPEG4Extractor::parseChunk function in MPEG4Extractor.cpp in libstagefright in mediaserver in…
• CVE-2015-3836 — Critical (CVSS 10.0): The Parse_wave function in arm-wt-22k/lib_src/eas_mdls.c in the Sonivox DLS-to-EAS converter in Android before 5.1.1…
• CVE-2015-3834 — Critical (CVSS 10.0): Multiple integer overflows in the BnHDCP::onTransact function in media/libmedia/IHDCP.cpp in libstagefright in Android…

Browse all CWE-189 (Numeric Errors) vulnerabilities →