CVE-2021-2351

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

2.43% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 83.0% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-08-25.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2021-07-20 22:43Z5 YR AGO

Last updated

2024-08-03 16:38Z2 YR AGO

Reserved

2020-12-09

Assigning CNA

oracle

Record state

PUBLISHED

Severity

High (CVSS 8.3)

CNA CVSS vector

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

Weaknesses

• CWE-327Use of a Broken or Risky Cryptographic AlgorithmClass
• CWE-384Session FixationCompound

Data version

5.1

Document digest

14011a8b818b0b3459f23505246524aad95b49c7eaab5bcb6def57e0ed624377

• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2021.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
• seclists.org20211210 [SYSS-2021-061] Oracle Database - NNE Connection Hijackinghttp://seclists.org/fulldisclosure/2021/Dec/19mailing-listx_refsource_FULLDISC
• seclists.org20211210 [SYSS-2021-062] Oracle Database - Weak NNE Integrity Key Derivationhttp://seclists.org/fulldisclosure/2021/Dec/20mailing-listx_refsource_FULLDISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlx_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/165258/Oracle-Database-Weak-NNE-Integrity-Key-Derivation.htmlx_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/165255/Oracle-Database-Protection-Mechanism-Bypass.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.htmlx_refsource_MISC
• www.oracle.comOracle Advisoryhttps://www.oracle.com/security-alerts/cpujan2023.htmlvendor-advisory