CVE-2021-23839

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.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• 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

2.96% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 87.0% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2021-02-16 16:55Z5 YR AGO

Last updated

2024-09-17 03:59Z2 YR AGO

Reserved

2021-01-12

Assigning CNA

openssl

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-327Use of a Broken or Risky Cryptographic AlgorithmClass

Data version

5.1

Document digest

f9bb0d4b8411631b91d23ed82c86a17e3c8408a16d0d4c4f50b6fcda122cc094

• www.openssl.orghttps://www.openssl.org/news/secadv/20210216.txt
• git.openssl.orghttps://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=30919ab80a478f2d81f2e9acdcca3fa4740cd547
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuApr2021.html
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210219-0009/
• www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.html
• kb.pulsesecure.nethttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44846
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.html
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.html
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20240621-0006/