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CVE-2015-7221

26
FAUCET Score

CVE-2015-7221 describes a buffer overflow vulnerability in the nsDeque::GrowCapacity function within Mozilla Firefox before version 43.0, impacting products from fedoraproject, mozilla, and opensuse. This flaw carries a critical CVSS score of 10.0, indicating a network-exploitable vulnerability with low attack complexity that could lead to a denial of service or potentially remote code execution with full confidentiality, integrity, and availability impact. Despite its high severity, there is no evidence of active exploitation, no known public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 42.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
22CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
23CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*

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
4.51%
Probability of exploitation in next 30 days
EPSS Percentile
90.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0451 is in the 83rd percentile among its peer group of 51,551 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

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-7221Moderate

Mozilla: Buffer overflows found through code inspection (MFSA 2015-144)

Dec 16, 2015

References

lists.fedoraproject.org / pipermail/package-announce/2015-December/174083.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-December/174253.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2015-12/msg00104.html
lists.opensuse.org / opensuse-updates/2016-02/msg00007.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2016-02/msg00008.html
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue Tracking
hg.mozilla.org / mozilla-central/rev/7fd961937687
Issue TrackingPatch
security.gentoo.org / glsa/201512-10
mozilla.org / security/announce/2015/mfsa2015-144.html
Vendor Advisory
securityfocus.com / bid/79280
securitytracker.com / id/1034426
ubuntu.com / usn/USN-2833-1