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CVE Record

CVE-2018-18498: A potential vulnerability leading to an integer overflow can occur during buffer size calculations for imag...

A potential vulnerability leading to an integer overflow can occur during buffer size calculations for images when a raw value is used instead of the checked value. This leads to a possible out-of-bounds write. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2018-18498 is a Mozilla image-processing flaw where incorrect buffer-size math could cause memory to be written outside its intended area. It affects older Firefox, Firefox ESR, and Thunderbird versions. The bundle does not provide CVSS severity, confirmed exploitation, or proof of compromise evidence.

Executive priority

Prioritize remediation where outdated Mozilla products remain in user-facing desktop fleets or managed images. The issue is old, but memory-write flaws in browsers and mail clients can carry serious workstation risk when left unpatched.

Technical view

The CVE describes an integer overflow during image buffer size calculations, using a raw value instead of a checked value. The result is a possible out-of-bounds write. Affected versions are Thunderbird before 60.4, Firefox ESR before 60.4, and Firefox before 64.

Likely exposure

Exposure is most likely on endpoints or servers running outdated Mozilla Firefox, Firefox ESR, or Thunderbird packages, including Linux distribution builds referenced by Debian, Ubuntu, Red Hat, and Gentoo advisories.

Exploitation context

The provided bundle does not show active exploitation, and KEV status is false. Because the bug is in image handling, practical risk would depend on users or applications processing crafted image content in affected Mozilla products.

Researcher notes

Severity metadata is incomplete in the supplied bundle: no CVSS, CWE, or exploit confirmation is provided. Analysis should stay anchored to Mozilla’s affected-version statement and downstream vendor advisories unless additional primary evidence is reviewed.

Mitigation direction

  • Upgrade Firefox to 64 or later where applicable.
  • Upgrade Firefox ESR to 60.4 or later.
  • Upgrade Thunderbird to 60.4 or later.
  • Apply vendor Linux security updates from your distribution.
  • Check Mozilla and OS vendor advisories for environment-specific guidance.

Validation and detection

  • Inventory Firefox, Firefox ESR, and Thunderbird versions across endpoints.
  • Confirm installed versions are not below the fixed release thresholds.
  • Check package manager history for Debian, Ubuntu, Red Hat, or Gentoo security updates.
  • Review vulnerability scanner results against CVE-2018-18498.
  • Validate no unsupported Mozilla builds remain in managed images.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2018-18498 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
15Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaThunderbirdunspecifiedListed
MozillaFirefox ESRunspecifiedListed
MozillaFirefoxunspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.