In versions 13.0.0-13.0.0 HF2, 12.1.0-12.1.2 HF1, and 11.6.1-11.6.2, BIG-IP platforms with Cavium Nitrox SSL hardware acceleration cards, a Virtual Server configured with a Client SSL profile, and using Anonymous (ADH) or Ephemeral (DHE) Diffie-Hellman key exchange and Single DH use option not enabled in the options list may be vulnerable to crafted SSL/TLS Handshakes that may result with a PMS (Pre-Master Secret) that starts in a 0 byte and may lead to a recovery of plaintext messages as BIG-IP TLS/SSL ADH/DHE sends different error messages acting as an oracle. Similar error messages when PMS starts with 0 byte coupled with very precise timing measurement observation may also expose this vulnerability.
Published 2020-09-25 14:15:14
Updated 2021-07-21 11:39:24
Source F5 Networks
View at NVD,

Exploit prediction scoring system (EPSS) score for CVE-2020-5929

Probability of exploitation activity in the next 30 days: 0.17%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 53 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2020-5929

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source

CWE ids for CVE-2020-5929

  • The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
    Assigned by: (Primary)

References for CVE-2020-5929

Products affected by CVE-2020-5929

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