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CVE-2024-4778

26
FAUCET Score

CVE-2024-4778 is a critical memory safety vulnerability affecting Mozilla Firefox versions prior to 126. These bugs could lead to memory corruption, potentially allowing an attacker to execute arbitrary code. With a CVSS score of 9.8, it represents a severe risk, as it can be exploited remotely without user interaction and result in complete compromise of confidentiality, integrity, and availability. While no active exploits, public exploit code, or significant community discussion have been observed, the high severity warrants immediate patching.

Impacted Technologies

VendorProductVersion(s)CPE
< 126.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 126CPE match
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
36.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 13th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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)

microsoft2024-May/CVE-2024-4778Critical

Memory safety bugs present in Firefox 125. 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 < 126.

May 14, 2024

References

bugzilla.mozilla.org / buglist.cgi
Issue Tracking
mozilla.org / security/advisories/mfsa2024-21
Vendor Advisory