CVE-2021-22926

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

9.82% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 95.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2021-08-05 00:00Z5 YR AGO

Last updated

2026-05-28 19:49Z3 MO AGO

Reserved

2021-01-06

Assigning CNA

hackerone

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-840
• CWE-295Improper Certificate ValidationBase

Data version

5.2

Document digest

a76f56b311e3dd311bde5466b7afae85d11e248dde8d52dc98c835eda2c90de0

• hackerone.comhttps://hackerone.com/reports/1234760
• lists.apache.org[kafka-dev] 20210831 Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker imagehttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cdev.kafka.apache.org%3Emailing-list
• lists.apache.org[kafka-users] 20210831 Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker imagehttps://lists.apache.org/thread.html/r61db8e7dcb56dc000a5387a88f7a473bacec5ee01b9ff3f55308aacc%40%3Cusers.kafka.apache.org%3Emailing-list
• lists.apache.org[kafka-users] 20210901 Re: [EXTERNAL] Re: Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker imagehttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cusers.kafka.apache.org%3Emailing-list
• lists.apache.org[kafka-dev] 20210901 Re: [EXTERNAL] Re: Security vulnerabilities in kafka:2.13-2.6.0/2.7.0 docker imagehttps://lists.apache.org/thread.html/rbf4ce74b0d1fa9810dec50ba3ace0caeea677af7c27a97111c06ccb7%40%3Cdev.kafka.apache.org%3Emailing-list
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.html
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210902-0003/
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.html
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20211022-0003/
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
• security.gentoo.orgGLSA-202212-01https://security.gentoo.org/glsa/202212-01vendor-advisory