CVE-2015-4484

CVE-2015-4484 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 5.0. 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-119.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.0)
• EPSS exploit prediction: 4% (90th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Mozilla Firefox
• Published: 2015-08-16
• Last modified: 2026-06-17

Description

The js::jit::AssemblerX86Shared::lock_addl function in the JavaScript implementation in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 allows remote attackers to cause a denial of service (application crash) by leveraging the use of shared memory and accessing (1) an Atomics object or (2) a SharedArrayBuffer object.

Frequently asked questions

What is CVE-2015-4484?

The js::jit::AssemblerX86Shared::lock_addl function in the JavaScript implementation in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 allows remote attackers to cause a denial of service (application crash) by leveraging the use of shared memory and accessing (1) an Atomics object or (2) a SharedArrayBuffer object.

How severe is CVE-2015-4484?

CVE-2015-4484 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-4484 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-4484?

CVE-2015-4484 primarily affects Mozilla Firefox. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2015-4484?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-4484 published?

CVE-2015-4484 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/mfsa2015-87.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
• https://bugzilla.mozilla.org/show_bug.cgi?id=1171540
• https://security.gentoo.org/glsa/201605-06

Affected products (11)

• 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:*:*:*:*:*:*:*
• 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:oracle:solaris:11.3:*:*:*:*:*:*:*

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