CVE-2021-20201

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

2.70% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 84.6% of scored records. A rank, not a probability.

NVD base score

5.3 (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:L

NVD analysis status

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

Red Hat severity

Low. 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

2021-05-28 10:42Z5 YR AGO

Last updated

2024-08-03 17:30Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.1

Document digest

5ea6872037a79fd95abb64a1411dced75f8af29bfb72ec479922cb41ed2deb8b

• bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1921846x_refsource_MISC
• blog.qualys.comhttps://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacksx_refsource_MISC
• security.gentoo.orgGLSA-202208-10https://security.gentoo.org/glsa/202208-10vendor-advisoryx_refsource_GENTOO