CVE-2021-3801: Inefficient Regular Expression Complexity in prismjs/prism
First published: Sat Sep 11 2021(Updated: )
Insufficient Regular Expression Complexity in prismjs leads to a Regular Expression Denial of Service (ReDoS) attack. An unauthenticated attacker can exploit this flaw to cause an application to consume an excess amount of CPU by providing a crafted HTML comment as input. This can result in a denial of service attack.
Credit: security@huntr.dev
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Prismjs Prism | <1.25.0 |
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Reference Links
- https://github.com/prismjs/prism/commit/0ff371bb4775a131634f47d0fe85794c547232f9
- https://huntr.dev/bounties/8c16ab31-6eb6-46d1-b9a4-387222fe1b8a
- https://www.cve.org/CVERecord?id=CVE-2021-3801 https://nvd.nist.gov/vuln/detail/CVE-2021-3801
- https://bugzilla.redhat.com/show_bug.cgi?id=2005445
- https://access.redhat.com/errata/RHSA-2021:4902
- https://access.redhat.com/security/cve/cve-2021-3801
Frequently Asked Questions
What is CVE-2021-3801?
CVE-2021-3801 is a vulnerability in prismjs that allows an unauthenticated attacker to cause a denial of service (DoS) attack by exploiting insufficient regular expression complexity.
How does CVE-2021-3801 work?
CVE-2021-3801 works by allowing an attacker to provide a crafted HTML comment as input, causing an application to consume excessive amounts of CPU resources.
What is the severity of CVE-2021-3801?
The severity of CVE-2021-3801 is rated as high, with a CVSS score of 6.5.
What is the affected software of CVE-2021-3801?
The affected software of CVE-2021-3801 includes Prismjs versions up to exclusive 1.25.0 and Node.js version in the CPE 'cpe:2.3:a:prismjs:prism:*:*:*:*:*:node.js:*:*' up to exclusive 1.25.0.
How can CVE-2021-3801 be remediated?
To remediate CVE-2021-3801, it is recommended to update Prismjs to version 1.25.0 or higher.
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