CVE-2013-1677

CRITICAL

The gfxSkipCharsIterator::SetOffsets function in Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 allows remote attacke...

Affects 3 products across 1 vendor.

CVSS 2.010.0
EPSS5.5%
Percentile93th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
CWE Weakness Definitions
CWE-399: Resource Management Errors

Broad class covering failures in managing system resources such as memory, file handles, and connections.

◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2013. A critical vulnerability affects Mozilla systems (CVE-2013-1677). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2013-GLOBAL-094029-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2013-1677?
This vulnerability was disclosed in 2013. A critical vulnerability affects Mozilla systems (CVE-2013-1677). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2013-1677?
CVE-2013-1677 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 5.5%.
Is CVE-2013-1677 actively exploited?
No confirmed active exploitation of CVE-2013-1677 as of 2026-09-25.
How do I remediate CVE-2013-1677?
Priority: MEDIUM. Advisory: http://www.mozilla.org/security/announce/2013/mfsa2013-48.html PSIRT: [email protected]
What systems are affected by CVE-2013-1677?
CVE-2013-1677 affects Mozilla Firefox, Thunderbird, Thunderbird Esr.
Vulnerability Details
CVE IDCVE-2013-1677
BSIDBS-2013-GLOBAL-094029-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published2013-05-16
Last Modified2026-06-16
ICS Relevance0%
Weakness (CWE)
Resource Management Errors
SourceNVD
Official Description

The gfxSkipCharsIterator::SetOffsets function in Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read) via unspecified vectors.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: The gfxSkipCharsIterator::SetOffsets function in Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 allows remote attackers to execute arbitrary code or cause a denial of service (out-of-bounds read) via unspecified vectors. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products
VendorProductAffected Versions
Mozilla Firefox ≤ 20.0.1
Mozilla Thunderbird ≤ 17.0.5
Mozilla Thunderbird Esr 17.0 17.0.1 17.0.2 17.0.3 17.0.4 17.0.5
Remediation
View Vendor Advisory →

Remediation Priority: MEDIUM

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 4900 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 Hashbf03f3b913764daf1c5e8f9c0b2174580cd46032c3dbf52a4ebdf5357f45b8d74421b209eb7eabd9e20add52ad9acb338372fcb16e1736aad8c983ace6ac8be3
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