CVE-2021-33796

Critical

Published: 07 July 2023

Published

07 July 2023

Modified

21 November 2024

KEV Added

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Patch

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CVSS Score v3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Score 0.0013 31.6th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-33796 is a critical-severity Use After Free (CWE-416) vulnerability in Artifex Mujs. Its CVSS base score is 10.0 (Critical).

Operationally, ranked at the 31.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

artifex

mujs

≤ 1.1.2

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.