CVE-2024-4778

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.

Published: 2024-05-14 Last update: 2025-04-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-4778 is rated Moderate Risk (60.7/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.41%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-4778

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-10-03 0.31% 0.41% +0.11%
2 2025-09-14 0.39% 0.31% -0.09%
3 2025-06-22 — 0.39% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-4778

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-4778

OS Trackers for CVE-2024-4778

vendor priority summary link
alpine — CVE-2024-4778: 1 source package rows (firefox); 104 state rows across 2 repos (3.22-community, edge-community); fixed 0, open 104. https://security.alpinelinux.org/vuln/CVE-2024-4778
debian not yet assigned CVE-2024-4778 not yet assigned priority: Debian including 1 source packages (firefox), 1 status rows across 1 suites (sid): resolved 1. https://security-tracker.debian.org/tracker/CVE-2024-4778
gentoo high CVE-2024-4778: 1 GLSA(s) (202408-02), 2 atom(s) (www-client/firefox, www-client/firefox-bin); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-4778
ubuntu medium CVE-2024-4778 medium priority: Ubuntu including 8 source packages (firefox, mozjs102, …), 42 status rows across 6 suites (bionic, focal, jammy, mantic, noble, upstream): DNE 18, ignored 16, not-affected 5, needs-triage 2, released 1. https://ubuntu.com/security/CVE-2024-4778

Affected software / configurations for CVE-2024-4778

Vendor Product Version Raw CPE
mozilla firefox < 126.0 cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

References for CVE-2024-4778

cvelogic Threat Intelligence