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CVE-2023-4576

26
FAUCET Score

CVE-2023-4576 is an integer overflow vulnerability in Firefox and Thunderbird on Windows, specifically within the RecordedSourceSurfaceCreation component. This flaw could lead to a heap buffer overflow, potentially exposing sensitive data and enabling a sandbox escape. Rated with a CVSS score of 8.6 (High), it has a low attack complexity and requires no user interaction, making it a significant risk for affected Windows users. While there is no known active exploitation or public exploit code, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
< 117.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
>= 115.0, < 115.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 102.15CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
< 115.2CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.6HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.69%
Probability of exploitation in next 30 days
EPSS Percentile
48.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0069 is in the 25th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

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

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2023-4576Important

Mozilla: Integer Overflow in RecordedSourceSurfaceCreation

Aug 29, 2023

References

bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPermissions Required
mozilla.org / security/advisories/mfsa2023-34
Vendor Advisory
mozilla.org / security/advisories/mfsa2023-35
Vendor Advisory
mozilla.org / security/advisories/mfsa2023-36
Vendor Advisory
mozilla.org / security/advisories/mfsa2023-37
mozilla.org / security/advisories/mfsa2023-38
Vendor Advisory