Vulnerability in Discourse
CVE-2023-23621
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (57.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Discourse — versions 2.4.0, 3.1.0, < 3.0.1
Weakness classification (CWE)
References
- github.com/discourse/discourse/security/advisories/GHSA-mrfp-54hf-jrcv (Third Party Advisory)
- github.com/discourse/discourse/pull/20002 (Patch, Issue Tracking)
- github.com/discourse/discourse/commit/6d92c3cbdac431db99a450f360a3048bb3aaf458 (Patch)
Frequently asked questions
- What is CVE-2023-23621?
- CVE-2023-23621 is a high-severity vulnerability in Discourse, classified under Inefficient Regular Expression Complexity. CVSS score: 8.6/10. Published 2023-01-28.
- How severe is CVE-2023-23621?
- High severity. CVSS v3 base score is 8.6 out of 10.