Home/CVE/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 ac
CVE

CVE-2020-5929

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 ac

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.

MEDIUM · CVSS 5.9 EPSS 0.00668
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
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Weakness Classification

CWE-203Observable Discrepancy
▤

Affected Products & Versions

24
f5 big-ip access policy manager>= 11.6.1 and < 11.6.2
f5 big-ip access policy manager>= 12.1.0 and < 12.1.2
f5 big-ip access policy managerall versions
f5 big-ip advanced firewall manager>= 11.6.1 and < 11.6.2
f5 big-ip advanced firewall manager>= 12.1.0 and < 12.1.2
f5 big-ip advanced firewall managerall versions
f5 big-ip advanced web application firewall>= 11.6.1 and < 11.6.2
f5 big-ip advanced web application firewall>= 12.1.0 and < 12.1.2
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Scoring & Timeline

5.9
MEDIUM · CVSS v3.1 · f5sirt@f5.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD25 Sep 2020 · 02:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://support.f5.com/csp/article/K91158923Vendor Advisory
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