How severe is CVE-2021-33797?

CVE-2021-33797 has a CVSS 3.x base score of 9.8, 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-2021-33797 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33797?

CVE-2021-33797 affects Artifex Mujs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-33797?

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-2021-33797 published?

CVE-2021-33797 was published on 2023-04-17 and last updated on 2026-06-17.

CVE-2021-33797

CVE-2021-33797 is a critical-severity vulnerability in Artifex Mujs with a CVSS 3.x base score of 9.8. 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-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-190
Affected product: Artifex Mujs
Published: 2023-04-17
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-33797?: 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.
How severe is CVE-2021-33797?: CVE-2021-33797 has a CVSS 3.x base score of 9.8, 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-2021-33797 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33797?: CVE-2021-33797 affects Artifex Mujs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-33797?: 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-2021-33797 published?: CVE-2021-33797 was published on 2023-04-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:artifex:mujs:*:*:*:*:*:*:*:*

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