What is CVE-2024-21337?

CVE-2024-21337 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Heap-based Buffer Overflow. CVSS score: 5.2/10. Published 2024-01-11.

How severe is CVE-2024-21337?

Medium severity. CVSS v3 base score is 5.2 out of 10.

Is CVE-2024-21337 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Microsoft Edge Chromium

CVE-2024-21337

Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability

Vulnerability class: Buffer Overflow

Published 2024-01-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.2 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (29.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Microsoft Edge Chromium
Microsoft Edge (Chromium-Based) — versions 1.0.0
Microsoft Edge (Chromium-Based) Extended Stable — versions 1.0.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

NaInSec/CVE-LIST

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21337 (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2024-21337?: CVE-2024-21337 is a medium-severity vulnerability in Microsoft Edge Chromium, classified under Heap-based Buffer Overflow. CVSS score: 5.2/10. Published 2024-01-11.
How severe is CVE-2024-21337?: Medium severity. CVSS v3 base score is 5.2 out of 10.
Is CVE-2024-21337 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.