CVE-2021-33796 json
In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.
published 2023-07-07 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20473
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.
Patch / fix
- artifex mujs 1.1.2
- mujs Debian 14, Debian 13, Debian 12 1.1.3-2
debian advisories DEBIAN-CVE-2021-33796
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2021-33796 updated cvss 5.5
MuJS: Use-after-free in regexp source property access
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 23 mo ago
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
- MuJS MuJS
Classification
- Weakness
-
- CWE-416 Use After Free
References
Sources
- CVE List CVE-2021-33796
- NVD CVE-2021-33796
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.