CVE-2024-8384: Mozilla Firefox · Garbage collection could mis-color cross-compartment objects in OOM conditions
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited · CVSS 9.8 Critical · fixed in 130 : patch Mozilla Firefox as a priority.
Data as of 25 Oct 2026, 19:02 UTC
- EPSS
- 0.7% chance of exploitation in 30 days – higher than 53% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 130, 128.2, 115.15
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 3 Sep 2024
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 2026-10-25.
What to do
Upgrade Mozilla Firefox to 130, 128.2 or 115.15.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
1. 2. If you cannot patch yet, consider deploying network-level protections such as web filtering to block access to untrusted or potentially malicious websites. 3. Monitor browser crash reports and memory usage patterns to detect anomalies that may indicate exploitation attempts involving OOM conditions. 4. Employ endpoint detection and response (EDR) solutions capable of identifying memory corruption exploits and unusual process behaviors related to Firefox and Thunderbird. 5. Educate users about the risks of visiting untrusted websites and opening suspicious links, even though no user interaction is required for exploitation, as reducing exposure lowers risk. 6. Review and harden browser sandboxing and compartmentalization settings where possible to limit the impact of potential exploitation. 7. Coordinate with IT asset management to inventory all Firefox and Thunderbird installations to ensure timely patch deployment across the organization. 8. Engage with Mozilla security advisories and subscribe to vulnerability notifications to stay informed about patch releases and exploit developments.
Description
The JavaScript garbage collector could mis-color cross-compartment objects if OOM conditions were detected at the right point between two passes. This could have led to memory corruption. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, Firefox ESR < 115.15, Thunderbird < 128.2, and Thunderbird < 115.15.
References
- bugzilla.mozilla.org/show_bug.cgi?id=1911288 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-39/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-40/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-41/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-43/ (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-44/ (opens in a new tab)
- lists.debian.org/debian-lts-announce/2024/09/msg00025.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2024/09/msg00012.html (opens in a new tab)