CVE-2021-42567
MEDIUMCVSS 6.1/10EPSS 8.06%
Last modified
CVE-2021-42567 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.. EPSS estimates a 8.06% chance of exploitation in the next 30 days.
Description
Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apereo | Central Authentication Service | >= 6.3.0, < 6.3.7.1 |
| Apereo | Central Authentication Service | >= 6.4.0, < 6.4.2 |
References
- https://apereo.github.io/2021/10/18/restvuln/Patch, Third Party Advisory
- https://github.com/apereo/cas/releasesRelease Notes, Third Party Advisory
- https://apereo.github.io/2021/10/18/restvuln/Patch, Third Party Advisory
- https://github.com/apereo/cas/releasesRelease Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-42567?
Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.
How severe is CVE-2021-42567?
CVE-2021-42567 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 8.06% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42567?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-42567?
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