CVE-2008-5014

CRITICAL

jslock.cpp in Mozilla Firefox 3.x before 3.0.2, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (c...

Affects 5 products across 3 vendors.

CVSS 2.010.0
EPSS5.9%
Percentile93th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
CWE Weakness Definitions
CWE-20: Improper Input Validation

Software does not validate or incorrectly validates input, allowing attackers to craft data processed in unintended ways.

Related Attack Patterns (CAPEC)
CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
via CWE-20
CAPEC-7 Blind SQL Injection
via CWE-20
CAPEC-8 Buffer Overflow in an API Call
via CWE-20
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-20
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-20
Show all 51
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20
via CWE-20

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

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2008. A critical vulnerability affects Canonical systems (CVE-2008-5014). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2008-GLOBAL-327265-C • Model: rule-based-v1 • Confidence: MEDIUM

Is this CVE in your environment?

BreachSpider monitors your ICS/OT environment for vulnerabilities like this one. No agents or network access required. Free to start.

Check My Environment →
Frequently Asked Questions
What is CVE-2008-5014?
This vulnerability was disclosed in 2008. A critical vulnerability affects Canonical systems (CVE-2008-5014). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2008-5014?
CVE-2008-5014 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 5.9%.
Is CVE-2008-5014 actively exploited?
No confirmed active exploitation of CVE-2008-5014 as of 2026-09-25.
How do I remediate CVE-2008-5014?
Priority: MEDIUM. Advisory: http://www.mozilla.org/security/announce/2008/mfsa2008-50.html PSIRT: [email protected]
What systems are affected by CVE-2008-5014?
CVE-2008-5014 affects Canonical Ubuntu Linux; Debian Debian Linux; Mozilla Firefox, Thunderbird, Seamonkey.
Vulnerability Details
CVE IDCVE-2008-5014
BSIDBS-2008-GLOBAL-327265-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2008-11-13
Last Modified2026-06-16
ICS Relevance0%
Weakness (CWE)
Improper Input Validation
SourceNVD
Official Description

jslock.cpp in Mozilla Firefox 3.x before 3.0.2, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code by modifying the window.__proto__.__proto__ object in a way that causes a lock on a non-native object, which triggers an assertion failure related to the OBJ_IS_NATIVE function.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: jslock.cpp in Mozilla Firefox 3.x before 3.0.2, Firefox 2.x before 2.0.0.18, Thunderbird 2.x before 2.0.0.18, and SeaMonkey 1.x before 1.1.13 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code by modifying the window.__proto__.__proto__ object in a way that causes a lock on a non-native object, which triggers an assertion failure related to the OBJ_IS_NATIVE function. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products
VendorProductAffected Versions
Canonical Ubuntu Linux 6.06 7.10 8.04 8.10
Debian Debian Linux 4.0
Mozilla Firefox ≥ 2.0, < 2.0.0.18 ≥ 3.0, < 3.0.2
Mozilla Thunderbird ≥ 2.0, < 2.0.0.18
Mozilla Seamonkey ≥ 1.0, < 1.1.13
Remediation
View Vendor Advisory →

Remediation Priority: MEDIUM

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 6545 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hashdb8e86299e35397558a8349e7f0a22c4409204f2b1ecf541d789a5010d6be83677b84fee4862792aeab73663b8ceb198df4c4eb133fa11b90acc12033cdde5df
Related CVEs affecting Canonical
CVE-2017-16845 10.0 hw/input/ps2.c in Qemu does not validate 'rptr' and 'count' values during gue... CVE-2007-0061 10.0 The DHCP server in EMC VMware Workstation before 5.5.5 Build 56455 and 6.x be... CVE-2008-5500 10.0 The layout engine in Mozilla Firefox 3.x before 3.0.5 and 2.x before 2.0.0.19... CVE-2014-1528 10.0 The sse2_composite_src_x888_8888 function in Pixman, as used in Cairo in Mozi... CVE-2014-6601 10.0 Unspecified vulnerability in Oracle Java SE 6u85, 7u72, and 8u25 allows remot...
View all Canonical CVEs →

Critical Severity - Know Your Exposure

A CVSS 10.0 vulnerability in your ICS environment cannot wait. BreachSpider maps critical CVEs to your specific assets and tells you what to fix first.

Create a free account →