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CVE-2025-1013VulnerabilityPublished Updated

CVE-2025-1013: Mozilla Firefox · Race Condition

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited · CVSS 6.5 Medium : upgrade to 135 when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 135
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Feb 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 2026-10-26.

What to do

Upgrade Mozilla Firefox to 135.

Affected software

ProductAffectedFixed in
Mozilla FirefoxAffected
  • <135
Fixed in
  • 135

AI-suggested

A fix for this vulnerability is available and has been incorporated in Mozilla Firefox 135 and Firefox ESR 128.7. Users and administrators should update affected Firefox installations to these versions or later to remediate the issue. Since the vulnerability is fixed in official releases, no additional mitigation steps are required.

Description

A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

References

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