What is CVE-2020-5894?

CVE-2020-5894 is a high-severity vulnerability in F5 nginx Controller, classified under Session Fixation. CVSS score: 8.1/10. Published 2020-05-07.

How severe is CVE-2020-5894?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in F5 nginx Controller

CVE-2020-5894

On versions 3.0.0-3.3.0, the NGINX Controller webserver does not invalidate the server-side session token after users log out.

Published 2020-05-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

F5 nginx Controller
nginx Controller — versions < 3.4.0

Weakness classification (CWE)

CWE-384 — Session Fixation

References

support.f5.com/csp/article/K13028514 (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2020-5894?: CVE-2020-5894 is a high-severity vulnerability in F5 nginx Controller, classified under Session Fixation. CVSS score: 8.1/10. Published 2020-05-07.
How severe is CVE-2020-5894?: High severity. CVSS v3 base score is 8.1 out of 10.