CVE-2021-33796
CVE-2021-33796 is a critical-severity vulnerability in Artifex Mujs with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.
Key facts
- Severity: Critical (CVSS 3.x base score 10.0)
- EPSS exploit prediction: 1% (49th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-416
- Affected product: Artifex Mujs
- Published:
- Last modified:
Description
In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.
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.
- How severe is CVE-2021-33796?
- CVE-2021-33796 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-33796 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-33796?
- CVE-2021-33796 affects Artifex Mujs. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-33796?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2021-33796 published?
- CVE-2021-33796 was published on 2023-07-07 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:artifex:mujs:*:*:*:*:*:*:*:*
More vulnerabilities in Artifex Mujs
- CVE-2021-33797 — Critical (CVSS 9.8): Buffer-overflow in jsdtoa.c in Artifex MuJS in versions 1.0.1 to 1.1.1. An integer overflow happens when js_strtod()…
- CVE-2021-45005 — Critical (CVSS 9.8): Artifex MuJS v1.1.3 was discovered to contain a heap buffer overflow which is caused by conflicting JumpList of nested…
- CVE-2019-12798 — Critical (CVSS 9.8): An issue was discovered in Artifex MuJS 1.0.5. regcompx in regexp.c does not restrict regular expression program size,…
- CVE-2019-11411 — Critical (CVSS 9.8): An issue was discovered in Artifex MuJS 1.0.5. The Number#toFixed() and numtostr implementations in jsnumber.c have a…
- CVE-2016-10133 — Critical (CVSS 9.8): Heap-based buffer overflow in the js_stackoverflow function in jsrun.c in Artifex Software, Inc. MuJS allows attackers…
- CVE-2016-10141 — Critical (CVSS 9.8): An integer overflow vulnerability was observed in the regemit function in regexp.c in Artifex Software, Inc. MuJS…
All CVEs affecting Artifex Mujs →
Other CWE-416 (Use After Free) vulnerabilities
- CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
- CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
- CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
- CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
- CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
- CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…