What is CVE-2021-35032?

CVE-2021-35032 is a medium-severity vulnerability in Zyxel Gs1900-10hp, classified under OS Command Injection. CVSS score: 6.4/10. Published 2021-12-28.

How severe is CVE-2021-35032?

Medium severity. CVSS v3 base score is 6.4 out of 10.

RCE in Zyxel Gs1900-10hp

CVE-2021-35032

A vulnerability in the 'libsal.so' of the Zyxel GS1900 series firmware version 2.60 could allow an authenticated local user to execute arbitrary OS commands via a crafted function call.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (11.9th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerab… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-35032?: CVE-2021-35032 is a medium-severity vulnerability in Zyxel Gs1900-10hp, classified under OS Command Injection. CVSS score: 6.4/10. Published 2021-12-28.
How severe is CVE-2021-35032?: Medium severity. CVSS v3 base score is 6.4 out of 10.