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Fencer Intel
medium 5.9

CVE-2020-5929 json

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…

published 6y ago modified 4mo ago also EUVD-2020-27083

cvss
5.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 65%
public exploits
0
none known

Summary

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.

Patch / fix

  • f5 big-ip_access_policy_manager 11.6.2, 12.1.2
  • f5 big-ip_advanced_firewall_manager 11.6.2, 12.1.2
  • f5 big-ip_advanced_web_application_firewall 11.6.2, 12.1.2
  • f5 big-ip_analytics 11.6.2, 12.1.2
  • f5 big-ip_application_acceleration_manager 11.6.2, 12.1.2
  • f5 big-ip_application_security_manager 11.6.2, 12.1.2
  • f5 big-ip_ddos_hybrid_defender 11.6.2, 12.1.2
  • f5 big-ip_domain_name_system 11.6.2, 12.1.2
  • f5 big-ip_fraud_protection_service 11.6.2, 12.1.2
  • f5 big-ip_global_traffic_manager 11.6.2, 12.1.2
  • f5 big-ip_link_controller 11.6.2, 12.1.2
  • f5 big-ip_local_traffic_manager 11.6.2, 12.1.2
  • f5 big-ip_policy_enforcement_manager 11.6.2, 12.1.2
  • f5 ssl_orchestrator 11.6.2, 12.1.2

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Exploit prediction

1.09% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.6 AV:N/AC:H/Au:N/C:P/I:N/A:N

Affected products

  • n/a BIG-IP

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.