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CVE-2024-6609VulnerabilityPublished Updated

CVE-2024-6609: Mozilla Firefox · Vulnerability

Affects Mozilla FirefoxSource CVE Database V5

0

Not known to be exploited · CVSS 8.8 High : upgrade to 128 soon.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 128
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Jul 2024

  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 2026-10-25.

What to do

Upgrade Mozilla Firefox to 128.

Affected software

ProductAffectedFixed in
Mozilla FirefoxAffected
  • <128
Fixed in
  • 128

AI-suggested

1. 2. If you cannot patch yet, consider restricting access to untrusted websites and email sources to reduce exposure. 3. Employ endpoint protection solutions capable of detecting anomalous memory usage or exploitation attempts related to use-after-free vulnerabilities. 4. Monitor application logs and system behavior for crashes or unusual memory allocation patterns indicative of exploitation attempts. 5. Educate users about the risks of interacting with untrusted web content and phishing emails that could trigger this vulnerability. 6. For organizations with high security requirements, consider deploying application sandboxing or isolation techniques to limit the impact of potential exploitation. 7. Coordinate with IT teams to ensure timely deployment of security updates and verify version compliance across all user endpoints.

Description

When almost out-of-memory an elliptic curve key which was never allocated could have been freed again. This vulnerability affects Firefox < 128 and Thunderbird < 128.

References

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