CVE-2015-7221

Buffer overflow in the nsDeque::GrowCapacity function in xpcom/glue/nsDeque.cpp in Mozilla Firefox before 43.0 might allow remote attackers to cause a denial of service or possibly have unspecified other impact by triggering a deque size change.

Published: 2015-12-16 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-7221 is rated High Risk (67.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 1.48%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2015-7221

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-09-29 1.70% 1.48% -0.21%
2 2025-07-03 1.60% 1.70% +0.10%
3 2025-07-02 — 1.60% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-7221

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2015-7221

OS Trackers for CVE-2015-7221

vendor priority summary link
gentoo normal CVE-2015-7221: 1 GLSA(s) (201512-10), 4 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-7221
redhat medium — https://access.redhat.com/security/cve/CVE-2015-7221
suse medium — https://www.suse.com/security/cve/CVE-2015-7221/
ubuntu medium CVE-2015-7221 medium priority: Ubuntu including 1 source packages (firefox), 5 status rows across 5 suites (precise, trusty, upstream, vivid, wily): released 5. https://ubuntu.com/security/CVE-2015-7221

Affected software / configurations for CVE-2015-7221

Vendor Product Version Raw CPE
mozilla firefox <= 42.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
fedoraproject fedora 22 cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
fedoraproject fedora 23 cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
opensuse leap 42.1 cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
opensuse opensuse 13.1 cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
opensuse opensuse 13.2 cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*

References for CVE-2015-7221

URL Tags
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174083.html Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174253.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2015-12/msg00104.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00007.html Third Party Advisory
http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html Third Party Advisory
http://www.mozilla.org/security/announce/2015/mfsa2015-144.html Vendor Advisory
http://www.securityfocus.com/bid/79280
http://www.securitytracker.com/id/1034426
http://www.ubuntu.com/usn/USN-2833-1
https://bugzilla.mozilla.org/show_bug.cgi?id=1199400 Issue Tracking
https://hg.mozilla.org/mozilla-central/rev/7fd961937687 Issue Tracking Patch
https://security.gentoo.org/glsa/201512-10
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