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CVE-2015-4484

16
FAUCET Score

CVE-2015-4484 is a denial-of-service vulnerability affecting Mozilla Firefox versions prior to 40.0 and Firefox ESR 38.x prior to 38.2, as well as products from Canonical, OpenSUSE, and Oracle. The flaw resides in the JavaScript engine's lock_addl function, allowing remote attackers to crash the application by manipulating Atomics or SharedArrayBuffer objects through shared memory. The vulnerability has a CVSS score of 5.0, indicating a medium severity. It can be exploited remotely with low attack complexity and requires no authentication, leading to a denial of service (application crash) without compromising confidentiality or integrity. There is no evidence of active exploitation, and no public exploit code is available in Metasploit, Nuclei, or ExploitDB. The vulnerability has received minimal community discussion and media coverage, suggesting a low profile and limited current threat.

Impacted Technologies

VendorProductVersion(s)CPE
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*
14.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
15.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
4.27%
Probability of exploitation in next 30 days
EPSS Percentile
90.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0427 is in the 87th percentile among its peer group of 23,725 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, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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-2015-4484Moderate

Mozilla: Crash when using shared memory in JavaScript (MFSA 2015-87)

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
debian.org / security/2015/dsa-3333
mozilla.org / security/announce/2015/mfsa2015-87.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