What is CVE-2024-0755?

CVE-2024-0755 is a high-severity vulnerability in Mozilla Firefox, classified under Code Injection. CVSS score: 8.8/10. Published 2024-01-23.

How severe is CVE-2024-0755?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2024-0755 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Mozilla Firefox

CVE-2024-0755

Memory safety bugs present in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6. 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 < 122, Firefox ESR < 115.7, and Thunderbird < 115.7.

Vulnerability class: RCE (Remote Code Execution)

Published 2024-01-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (53.3th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.008 · change: +0.000

Affected products

Mozilla Firefox — versions unspecified
Mozilla Firefox Esr — versions unspecified
Mozilla Firefox Esr
Mozilla Thunderbird — versions unspecified
Debian Linux — versions 10.0

Weakness classification (CWE)

CWE-94 — Code Injection

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

bugzilla.mozilla.org/buglist.cgi (Permissions Required, Issue Tracking)
www.mozilla.org/security/advisories/mfsa2024-01/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2024-02/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2024-04/ (Vendor Advisory)
lists.debian.org/debian-lts-announce/2024/01/msg00015.html (Mailing List, Third Party Advisory)
lists.debian.org/debian-lts-announce/2024/01/msg00022.html (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2024-0755?: CVE-2024-0755 is a high-severity vulnerability in Mozilla Firefox, classified under Code Injection. CVSS score: 8.8/10. Published 2024-01-23.
How severe is CVE-2024-0755?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2024-0755 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.