RCE in Opennds

CVE-2026-38820

openNDS before 11.0.0 is susceptible to unauthenticated OS command execution via shell command injection through the fas query parameter on the /opennds_preauth/ endpoint because of libopennds.sh.

Vulnerability class: Command Injection (OS Command Injection)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.029 (86.4th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-38820: rose from 0.017 to 0.029.

EPSS over last 30 days · oldest: 0.017 · newest: 0.029 · change: +0.011

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-38820?
CVE-2026-38820 is a high-severity vulnerability in Opennds, classified under OS Command Injection. CVSS score: 8.3/10. Published 2026-08-28.
How severe is CVE-2026-38820?
High severity. CVSS v3 base score is 8.3 out of 10.