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Vulnerability record · public intelligence
CVE-2023-5176
CRITICAL

CVE-2023-5176

Published Sep 27, 2023 · Updated Nov 3, 2026

Severity · CVSSCRITICAL · Not scored
Known exploitationNot listed
EPSS / likelihood1.39%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

Memory safety bugs present in Firefox 117, Firefox ESR 115.2, and Thunderbird 115.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

Memory safety bugs present in Firefox 117, Firefox ESR 115.2, and Thunderbird 115.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
MEDIUM
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. Memory safety bugs fixed in Firefox 118, Firefox ESR 115.3, and Thunderbird 115.3 ↗
  2. Security advisory ↗
  3. Security advisory ↗
  4. Security advisory ↗
  5. www.debian.org ↗
  6. lists.debian.org ↗
  7. www.debian.org ↗
  8. lists.debian.org ↗

Record history

Published Sep 27, 2023 · Last refreshed Nov 3, 2026

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