CVE-2015-7221
CWE-119Published: December 16, 2015· Updated: Jun 17, 2026
Official Description
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.
Risk Analysis
A buffer overflow in Mozilla Firefox's deque handling can be triggered remotely, potentially leading to a denial of service or arbitrary code execution. The critical CVSS score reflects the high impact of this memory corruption flaw.
No public exploit is known for this issue, and it is not in the CISA KEV. The vulnerability is remotely exploitable with low complexity.
Update Mozilla Firefox to version 43.0 or later to patch the underlying memory management defect.
Technical Analysis
CVE-2015-7221 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (24)
Quick Facts
Related CVEs (CWE-119)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2015-7221 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts