CVE-2021-42567
CVE-2021-42567 is a medium-severity vulnerability in Apereo Central Authentication Service with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v2: 4.3
- EPSS exploit prediction: 8% (94th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Apereo Central Authentication Service
- Published:
- Last modified:
Description
Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.
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 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2021-42567 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-42567?
- CVE-2021-42567 affects Apereo Central Authentication Service. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-42567?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-42567 published?
- CVE-2021-42567 was published on 2021-12-07 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*
More vulnerabilities in Apereo Central Authentication Service
- CVE-2023-4612 — Critical (CVSS 9.8): Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method…
- CVE-2024-4399 — Critical (CVSS 9.1): The does not validate a parameter before making a request to it, which could allow unauthenticated users to perform…
- CVE-2019-10754 — High (CVSS 8.1): Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes use of apache commons-lang3 RandomStringUtils…
- CVE-2020-27178 — High (CVSS 7.5): Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret…
- CVE-2015-1169 — High (CVSS 7.5): Apereo Central Authentication Service (CAS) Server before 3.5.3 allows remote attackers to conduct LDAP injection…
- CVE-2024-11209 — Medium (CVSS 6.3): A vulnerability was found in Apereo CAS 6.6. It has been classified as critical. This affects an unknown part of the…
All CVEs affecting Apereo Central Authentication Service →
Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities
- CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
- CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
- CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
- CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
- CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
- CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…
Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →