TI-2021-13164 Aliases CVE-2021-33797 GHSA-cm79-jwwm-5h7h

Memory corruption in mujs

HIGH 82CWE-119Published 2023-04-17 · Updated 2025-02-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

Buffer-overflow in jsdtoa.c in Artifex MuJS in versions 1.0.1 to 1.1.1. An integer overflow happens when js_strtod() reads in floating point exponent, which leads to a buffer overflow in the pointer *d.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00809 57th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	mujs	mujs in versions 1.0.1 to 1.1.1	—	No fix listed	CNA

mujs Vendor— Affected mujs in versions 1.0.1 to 1.1.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:artifex:mujs::::::::	1.0.1 – 1.1.1	Vulnerable	Artifex

cpe:2.3:a:artifex:mujs:*:*:*:*:*:*:*:* Versions 1.0.1 – 1.1.1 Vulnerable ·Artifex

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-33797
2026-10-03 Alias added: GHSA-cm79-jwwm-5h7h

References

Patch 1

https://github.com/ccxvii/mujs/commit/833b6f1672b4f2991a63c4d05318f0b84ef4d550

Advisory 1

https://github.com/ccxvii/mujs/issues/148

TI-2021-13163 In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service. CVSS 3.1CRITICAL 10.0
TI-2019-08527 An issue was discovered in Artifex MuJS 1.0.5. CVSS 3.0CRITICAL 9.8
TI-2016-08217 An integer overflow vulnerability was observed in the regemit function in regexp.c in… CVSS 3.1CRITICAL 9.8
TI-2016-06378 A buffer overflow vulnerability was observed in divby function of Artifex Software, Inc. CVSS 3.0CRITICAL 9.8
TI-2016-08209 Heap-based buffer overflow in the js_stackoverflow function in jsrun.c in Artifex… CVSS 3.0CRITICAL 9.8
TI-2016-06377 A use-after-free vulnerability was observed in Rp_toString function of Artifex Software… CVSS 3.0CRITICAL 9.8

See all 29 →

Sources

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