CVE-2024-4774

MEDIUMNVD 6.56.5—

6.5

The ShmemCharMapHashEntry() code was susceptible to potentially undefined behavior by bypassing the move semantics for one of its data members. This vulnerability affects Firefox < 126.

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 11.4%
KEV: Not listed

Published

May 14, 2024

Last Modified

March 28, 2025

References (4)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1886598
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2024-21/
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.mozilla.org/show_bug.cgi?id=1886598
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2024-21/

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	firefox-mozsymbols (126.0+build2-0ubuntu0.20.04.1) @ focal	2026-05-24	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-758

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

UbuntuUSN-6779-1MEDIUM
Firefox vulnerabilities

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 02:12 UTCEG score recompute
2026-05-24 02:12 UTCVendor advisory

Frequently asked(5)

What is CVE-2024-4774?

CVE-2024-4774 is a medium vulnerability published on May 14, 2024. The ShmemCharMapHashEntry() code was susceptible to potentially undefined behavior by bypassing the move semantics for one of its data members. This vulnerability affects Firefox < 126.

When was CVE-2024-4774 disclosed?

CVE-2024-4774 was first published in the National Vulnerability Database on May 14, 2024, with the most recent update on March 28, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2024-4774 actively exploited?

CVE-2024-4774 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2024-4774?

CVE-2024-4774 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2024-4774?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-4774, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-4774

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