CVE-2021-32723

Name: CVE-2021-32723
Creator: NVD / NIST
Published: 2021-06-28T20:15:07.857+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.42%

Last modified Jun 17, 2026

CVE-2021-32723 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Prism is a syntax highlighting library. Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS). EPSS estimates a 1.42% chance of exploitation in the next 30 days.

Description

Prism is a syntax highlighting library. Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS). When Prism is used to highlight untrusted (user-given) text, an attacker can craft a string that will take a very very long time to highlight. This problem has been fixed in Prism v1.24. As a workaround, do not use ASCIIDoc or ERB to highlight untrusted text. Other languages are not affected and can be used to highlight untrusted text.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

1.42%

69.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Prismjs	Prism	< 1.24.0
Oracle	Application Express	< 21.1.4

References

https://github.com/PrismJS/prism/pull/2688Patch, Third Party Advisory
https://github.com/PrismJS/prism/pull/2774Patch, Third Party Advisory
https://github.com/PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hgThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
https://github.com/PrismJS/prism/pull/2688Patch, Third Party Advisory
https://github.com/PrismJS/prism/pull/2774Patch, Third Party Advisory
https://github.com/PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hgThird Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory

Timeline

Published: Jun 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32723?

How severe is CVE-2021-32723?

CVE-2021-32723 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.42% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32723?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32723?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST