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CVE-2023-6873

24
FAUCET Score

CVE-2023-6873 describes memory safety bugs in Mozilla Firefox versions prior to 121, specifically impacting Firefox on Debian Linux. These vulnerabilities, rated with a CVSS score of 8.8 (High), could lead to memory corruption and potentially arbitrary code execution due to their nature as memory safety issues (CWE-787). While there is no evidence of active exploitation (KEV: No) and no public exploit code available, the vulnerability has garnered some community discussion and media coverage, with one article suggesting potential remote code execution.

Impacted Technologies

VendorProductVersion(s)CPE
< 121CPE match
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 121.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
11.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
12.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.85%
Probability of exploitation in next 30 days
EPSS Percentile
54.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0085 is in the 56th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

microsoft2023-Dec/CVE-2023-6873Important

Memory safety bugs present in Firefox 120. 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 < 121.

Dec 12, 2023

References

bugzilla.mozilla.org / buglist.cgi
Broken LinkIssue Tracking
lists.debian.org / debian-lts-announce/2023/12/msg00021.html
Mailing ListThird Party Advisory
security.gentoo.org / glsa/202401-10
Third Party Advisory
debian.org / security/2023/dsa-5582
Third Party Advisory
mozilla.org / security/advisories/mfsa2023-56
Vendor Advisory