What is the CVSS score of CVE-2021-42567?

CVE-2021-42567 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 8.1%.

Is there a public PoC exploit available for CVE-2021-42567?

Yes, a public proof-of-concept exploit is available for CVE-2021-42567. Prioritise patching immediately. EPSS: 8.1%.

Is there a patch available for CVE-2021-42567?

Yes, a patch is available for CVE-2021-42567. Update the affected software to the latest version immediately.

Central Authentication Service CVE-2021-42567

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2021-12-07 cve@mitre.org

XSS Central Authentication Service

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Dec 07, 2021 - 22:15 nvd

MEDIUM 6.1

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

46 maven packages depend on org.apereo.cas:cas-server-core-web (16 direct, 30 indirect)

Ecosystem-wide dependent count for version 6.4.2.

DescriptionNVD

Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.

AnalysisAI

Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Cross-Site Scripting (XSS) vulnerability could allow attackers to inject malicious scripts into web pages viewed by other users.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints. Affected products include: Apereo Central Authentication Service. Version information: through 6.4.1.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.