What is CVE-2020-27730?

CVE-2020-27730 is a critical-severity vulnerability in F5 nginx Controller, classified under Path Traversal. CVSS score: 9.8/10. Published 2020-12-11.

How severe is CVE-2020-27730?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Path Traversal in F5 nginx Controller

CVE-2020-27730

In versions 3.0.0-3.9.0, 2.0.0-2.9.0, and 1.0.1, the NGINX Controller Agent does not use absolute paths when calling system utilities.

Vulnerability class: Path Traversal (Directory Traversal)

Published 2020-12-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (77.0th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

F5 nginx Controller — versions 1.0.1
NetApp Cloud Backup
nginx Controller — versions 3.0.0-3.9.0, 2.0.0-2.9.0, 1.0.1

Weakness classification (CWE)

CWE-22 — Path Traversal

References

support.f5.com/csp/article/K43530108 (Vendor Advisory)
security.netapp.com/advisory/ntap-20210115-0004/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-27730?: CVE-2020-27730 is a critical-severity vulnerability in F5 nginx Controller, classified under Path Traversal. CVSS score: 9.8/10. Published 2020-12-11.
How severe is CVE-2020-27730?: Critical severity. CVSS v3 base score is 9.8 out of 10.