Is CVE-2021-33797 actively exploited?

No active exploitation of CVE-2021-33797 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33797 be exploited remotely?

Yes. CVE-2021-33797 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-33797?

CVE-2021-33797 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-33797

CWE-119Published: April 17, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

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.

NVD Source

Risk Analysis

A buffer overflow vulnerability exists in Artifex MuJS due to an integer overflow when processing floating-point exponents. This critical flaw, with a CVSS score of 9.8, could allow an attacker to execute arbitrary code.

There is no known public exploit, and the vulnerability is not in the KEV catalog. It is remotely exploitable with low attack complexity.

Recommended Action

Users should update to a version of MuJS that contains the fix for this buffer overflow.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-33797 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.