CVE-2021-21684

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.24% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 68.6% of scored records. A rank, not a probability.

NVD base score

6.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-10-06 22:10Z5 YR AGO

Last updated

2024-08-03 18:23Z2 YR AGO

Reserved

2021-01-04

Assigning CNA

jenkins

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-116Improper Encoding or Escaping of OutputClass
• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.1

Document digest

28ecc85be7fc4c5d4141fe27bffc008ff1980cd13baa024315f5defd6d121ec3

• www.jenkins.iohttps://www.jenkins.io/security/advisory/2021-10-06/#SECURITY-2499x_refsource_CONFIRM
• www.openwall.com[oss-security] 20211006 Multiple vulnerabilities in Jenkins and Jenkins pluginshttp://www.openwall.com/lists/oss-security/2021/10/06/1mailing-listx_refsource_MLIST