CVE-2015-7221

CRITICAL

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...

Affects 4 products across 3 vendors.

BCS7.62
CVSS 2.010.0
EPSS4.5%
Percentile91th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
CWE Weakness Definitions
CWE-119: Improper Restriction of Operations within Memory Buffer

Parent class for buffer-related vulnerabilities where operations exceed buffer boundaries.

Related Attack Patterns (CAPEC)
CAPEC-8 Buffer Overflow in an API Call
via CWE-119
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-119
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-119
CAPEC-14 Client-side Injection-induced Buffer Overflow
via CWE-119
CAPEC-24 Filter Failure through Buffer Overflow
via CWE-119
Show all 12

Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ SAGE Intelligence — CITED Relevance Research Team

This vulnerability was disclosed in 2015. A critical vulnerability affects Fedoraproject systems (CVE-2015-7221). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2015-GLOBAL-106344-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2015-7221?
This vulnerability was disclosed in 2015. A critical vulnerability affects Fedoraproject systems (CVE-2015-7221). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2015-7221?
CVE-2015-7221 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 4.5%.
Is CVE-2015-7221 actively exploited?
No confirmed active exploitation of CVE-2015-7221 as of 2026-05-30.
How do I remediate CVE-2015-7221?
Priority: MEDIUM.
What systems are affected by CVE-2015-7221?
CVE-2015-7221 affects: Fedoraproject, Mozilla, Opensuse, Opensuse.
Vulnerability Details
CVE IDCVE-2015-7221
BSIDBS-2015-GLOBAL-106344-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2015-12-16
Last Modified2026-05-06
ICS Relevance15%
Weakness (CWE)
Improper Restriction of Operations within Memory Buffer
SourceNVD
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.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: 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. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products
VendorProductFixed Version
Fedoraproject Fedora —
Mozilla Firefox —
Opensuse Opensuse —
Opensuse Leap —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: August 2026 | Threat Age: 3881 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash01b1db234bad965cd61d1a73f81755a5519d0263e5eaeb6d12872f0ae8a59b14794acda5f82259a4f9ff9be2093c40b9b34d404d92d8e194887deef1f6c662f2
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