Vulnerability in F5 Big-Ip Access Policy Manager
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 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 · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- F5 Big-Ip Access Policy Manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Advanced Firewall Manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Advanced Web Application Firewall — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Analytics — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Application Acceleration Manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Application Security Manager — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Ddos Hybrid Defender — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Domain Name System — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Fraud Protection Service — versions 11.6.2, 12.1.2, 13.0.0
- F5 Big-Ip Global Traffic Manager — versions 11.6.2, 12.1.2, 13.0.0
Weakness classification (CWE)
References
- support.f5.com/csp/article/K91158923 (Vendor Advisory)
Frequently asked questions
- What is CVE-2020-5929?
- CVE-2020-5929 is a medium-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under Observable Discrepancy. CVSS score: 5.9/10. Published 2020-09-25.
- How severe is CVE-2020-5929?
- Medium severity. CVSS v3 base score is 5.9 out of 10.