CVE-2023-3600VulnerabilityPublished 12 Jul 2023Updated 18 Dec 2025

CVE-2023-3600: Mozilla Firefox

Affects Mozilla FirefoxSource CVE Database V5

Not known to be exploited : upgrade to 115.0.2 soon.

Data as of 26 Oct 2026, 08:30 UTC

Severity

High

Rated High by the CNA (mozilla) · No CVSS score from NVD or the CNA

EPSS: 0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 115.0.2

Exploitation evidence

Disclosed: evidence found.
CVE published 12 Jul 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Mozilla Firefox to 115.0.2.

Affected software

Product	Affected	Fixed in
Mozilla Firefox	Affected <115.0.2	Fixed in 115.0.2

AI-suggested

Mozilla has released official fixes for this vulnerability in Firefox 115.0.2, Firefox ESR 115.0.2, and Thunderbird 115.0.1. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation steps are required beyond applying these updates.

Description

CVE-2023-3600 is a use-after-free vulnerability in Mozilla Firefox and Thunderbird that occurs during the worker lifecycle. This flaw could lead to a potentially exploitable crash. The vulnerability affects Firefox versions prior to 115.0.2, Firefox ESR versions prior to 115.0.2, and Thunderbird versions prior to 115.0.1. Mozilla has released fixed versions to address this issue.

Impact

The vulnerability can cause a use-after-free condition leading to a crash that may be exploitable, potentially allowing an attacker to execute arbitrary code or cause denial of service. The impact is rated high by Mozilla. There are no known exploits in the wild at this time.

Summary

The vulnerability CVE-2023-3600 involves a use-after-free condition during the lifecycle of workers in Mozilla Firefox and Thunderbird. This memory management flaw could cause a crash that might be exploited. The issue was reported by Andrew McCreight and is tracked under Bug 1839703. Mozilla fixed the vulnerability in Firefox 115.0.2, Firefox ESR 115.0.2, and Thunderbird 115.0.1.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 21:28 UTC

Technical details

References

Community reviews

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