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No exploitation reportedFix available

CVE-2021-33796

No exploitation reported by the sources we read.

  • Published2023-07-07
  • Fixed in1.1.2
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2023-07-0718:15CVE publishedNVD

Versions per branch

NVD
Artifex mujs
BranchAffectedFixed in
1.1< 1.1.21.1.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As fedora, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • MuJSother versions: not affected
    Affected
    • ≥ 1.1.1, ≤ allno fix statedrpm

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-07-07

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mujsDebian:14all versions · fixed in 1.1.3-2
  • mujsDebian:13all versions · fixed in 1.1.3-2
  • mujsDebian:12all versions · fixed in 1.1.3-2

Full record on NVD

Fix

  1. Update Artifex mujs to 1.1.2

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2024-11-12
  • CNACVSS 3.110known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-416known since 2026-10-23
  • NVDweakness (CWE)CWE-416read 2026-10-23
  • FIRST EPSSEPSS score0.7 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2023-07-07
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-pc6c-fw6q-cfhj

Frequently asked questions

What is CVE-2021-33796?

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

Is CVE-2021-33796 actively exploited?

Active exploitation of CVE-2021-33796 has not been confirmed. Its EPSS score was 0.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33796?

CVE-2021-33796 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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