CVE-2021-28235

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total 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

1.61% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 75.5% of scored records. A rank, not a probability.

NVD base score

9.8 (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:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-07-09.

Red Hat severity

Important. 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

2023-04-04 00:00Z3 YR AGO

Last updated

2026-07-09 00:12Z3 MO AGO

Reserved

2021-03-12

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-287Improper AuthenticationClass

Data version

5.2

Document digest

4cb35ed3b33bf17b40aa66ebcda55f92826dc8a0df36e74179455e19da7be021

• github.comhttps://github.com/etcd-io/etcd
• github.comhttps://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj.png
• github.comhttps://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj_2.png
• github.comhttps://github.com/etcd-io/etcd/pull/15648