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Full vulnerability report · 2018
CVE-2018-5159High confidence

An integer overflow can occur in the Skia library due to 32-bit integer use in an array without integer overflow checks, resulting in possible out-of-bounds writes

Mozilla · Thunderbird

9.8CriticalCVSS 3.0
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Fix not verified
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2018-16944

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Fix not verified
01

What, why and how

An integer overflow can occur in the Skia library due to 32-bit integer use in an array without integer overflow checks, resulting in possible out-of-bounds writes. This could lead to a potentially exploitable crash triggerable by web content. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.

What

An integer overflow can occur in the Skia library due to 32-bit integer use in an array without integer overflow checks, resulting in possible out-of-bounds writes. This could lead to a potentially exploitable crash triggerable by web content. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

An integer overflow can occur in the Skia library due to 32-bit integer use in an array without integer overflow checks, resulting in possible out-of-bounds writes. This could lead to a potentially exploitable crash triggerable by web content. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Integer Overflow or Wraparound → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-190

CWE-190: Integer Overflow or Wraparound. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-190Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

Canadian Centre for Cyber Security · English · AV18-077Mozilla security updates

Number: AV18-077 Date: 09 May 2018 Purpose The purpose of this advisory is to bring attention to a security update addressing multiple vulnerabilities in Mozilla Firefox. Assessment Mozilla have released security updates to address vulnerabilities in Firefox and Firefox ESR. Affected Versions: Firefox ESR versions prior to 52.8 Firefox versions prior to 60 CVE References:  CVE-2018-5154, CVE-2018-5155, CVE-2018-5157, CVE-2018-5158, CVE-2018-5159, CVE-2018-5160, CVE-2018-5152, CVE-2018-5153, CVE-2018-5163, CVE-2018-5164, CVE-2018-5166, CVE-2018-5167, CVE-2018-5168, CVE-2018-5169, CVE-2018-5172, CVE-2018-5173, CVE-2018-5174, CVE-2018-5175, CVE-2018-5176, CVE-2018-5177, CVE-2018-5165, CVE-2018-5180, CVE-2018-5181, CVE-2018-5182, CVE-2018-5151, CVE-2018-5150, CVE-2018-5183, CVE-2018-5154, CVE-2018-5155, CVE-2018-5157, CVE-2018-5158, CVE-2018-5159, CVE-2018-5168, CVE-2018-5174, CVE-2018-5178, CVE-2018-5150 Suggested Action CCIRC recommends that owner/operators test and deploy the vendor released updates to the affected platforms in accordance with their risk mitigation framework. Referen

Official advisory ↗
CERT-FR · French · CERTFR-2018-AVI-245Multiples vulnérabilités dans Mozilla Thunderbird

De multiples vulnérabilités ont été découvertes dans Mozilla Thunderbird. Certaines d'entre elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur, une exécution de code arbitraire à distance et un déni de service.

Official advisory ↗
CERT-FR · French · CERTFR-2018-AVI-230Multiples vulnérabilités dans Mozilla Firefox

US/security/advisories/mfsa2018-12/ Référence CVE CVE-2018-5150 https://www.cve.org/CVERecord?id=CVE-2018-5150 Référence CVE CVE-2018-5151 https://www.cve.org/CVERecord?id=CVE-2018-5151 Référence CVE CVE-2018-5152 https://www.cve.org/CVERecord?id=CVE-2018-5152 Référence CVE CVE-2018-5153 https://www.cve.org/CVERecord?id=CVE-2018-5153 Référence CVE CVE-2018-5154 https://www.cve.org/CVERecord?id=CVE-2018-5154 Référence CVE CVE-2018-5155 https://www.cve.org/CVERecord?id=CVE-2018-5155 Référence CVE CVE-2018-5157 https://www.cve.org/CVERecord?id=CVE-2018-5157 Référence CVE CVE-2018-5158 https://www.cve.org/CVERecord?id=CVE-2018-5158 Référence CVE CVE-2018-5159 https://www.cve.org/CVERecord?id=CVE-2018-5159 Référence CVE CVE-2018-5160 https://www.cve.org/CVERecord?id=CVE-2018-5160 Référence CVE CVE-2018-5163 https://www.cve.org/CVERecord?id=CVE-2018-5163 Référence CVE CVE-2018-5164 https://www.cve.org/CVERecord?id=CVE-2018-5164 Référence CVE CVE-2018-5165 https://www.cve.org/CVERecord?id=CVE-2018-5165 Référence CVE CVE-2018-5166 https://www.cve.org/CVERecord?id=CVE-2018-5166 Référence CVE CVE-2018-5167 https://www.cve.org/CVERecord?id=CVE-2018-5167 Référence CVE CVE-2018-5168 https://www.cve.org/CVERecord?id=CVE-2018-5168 Référence CVE CVE-2018-5169 https://www.cve.org/CVERecord?id=CVE-2018-5169 Ré

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2018-006395Thunderbird および Firefox における整数オーバーフローの脆弱性

Thunderbird および Firefox には、整数オーバーフローの脆弱性、および境界外書き込みに関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
  • Thunderbird: unspecified < 52.8
  • Thunderbird ESR: unspecified < 52.8
  • Firefox: unspecified < 60
  • Firefox ESR: unspecified < 52.8
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 11 Jun 2018 · Last source change 5 Aug 2024, 05:26 UTC · CWE-190 · Integer Overflow or Wraparound

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2018-16944
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed from vendor advisory to vendor advisory.
    Before
    vendor advisory
    After
    vendor advisory
    af854a3a-2127-422b-91ae-364da2661108
  2. SeveritySeverity changed from Unknown to Critical.
    Before
    Unknown
    After
    Critical
    NIST NVD
  3. CVSS scoreCVSS score changed from not recorded to 9.8 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
    Before
    not recorded
    After
    9.8 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
    NIST NVD
  4. ENISA EUVD mappingEUVD-2018-16944 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2018-16944"}
    ENISA EUVD
  5. Catalogue recordCVE added to the BlackTree catalogue.
    CNA
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2018-5159 · cve.blacktree.nl