6.1

CVE-2021-42567: apereo central_authentication_service Cross-site Scripting

CVSS: 6.1v3.1MediumModified
AliasesGHSA-gfhx-jjwq-63gv
Published 07-12-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-42567 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in apereo central_authentication_service. EPSS estimates a 8.19% chance of exploitation in the next 30 days, higher than 94.8% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
8.19%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-12-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

8.19%

Chance of exploitation in the next 30 days

Percentile

95%

Versus all other CVEs

30-day change

+0.13 pp

From 8.06% on 20-09-2026

20-09-202620-10-2026
EPSS score
8.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apereo1 product
Org.apereo.cas1 product
  • cas-server-core-web< 6.4.2

2 vendors · 2 products

References

6 links