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CVE-2023-23621

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Date: January 27, 2023

Discourse is an open-source discussion platform. Prior to version 3.0.1 on the `stable` branch and version 3.1.0.beta2 on the `beta` and `tests-passed` branches, a malicious user can cause a regular expression denial of service using a carefully crafted user agent. This issue is patched in version 3.0.1 on the `stable` branch and version 3.1.0.beta2 on the `beta` and `tests-passed` branches. There are no known workarounds.

Language: Ruby

Severity Score

Related Resources (5)

https://github.com/discourse/discourse/commit/6d92c3cbdac431db99a450f360a3048bb3aaf458
https://github.com/discourse/discourse/pull/20002
https://nvd.nist.gov/vuln/detail/CVE-2023-23621
https://github.com/discourse/discourse/security/advisories/GHSA-mrfp-54hf-jrcv
https://www.mend.io/vulnerability-database/CVE-2023-23621

Severity Score

Weakness Type (CWE)

Inefficient Regular Expression Complexity

CWE-1333

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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