CVE-2021-35032

Name: CVE-2021-35032
Creator: NVD / NIST
Published: 2021-12-28T11:15:07.583+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2021-35032 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zyxel	Gs1900-8 Firmware	< 2.70\(aahh.0\)-20211208
Zyxel	Gs1900-8hp Firmware	< 2.70\(aahi.0\)-20211208
Zyxel	Gs1900-10hp Firmware	< 2.70\(aazi.0\)-20211208
Zyxel	Gs1900-16 Firmware	< 2.70\(aahj.0\)-20211208
Zyxel	Gs1900-24e Firmware	< 2.70\(aahk.0\)-20211208
Zyxel	Gs1900-24ep Firmware	< 2.70\(abto.0\)-20211208
Zyxel	Gs1900-24 Firmware	< 2.70\(aahl.0\)-20211208
Zyxel	Gs1900-24hp Firmware	< 2.70\(aahm.0\)-20211208
Zyxel	Gs1900-24hpv2 Firmware	< 2.70\(aatp.0\)-20211208
Zyxel	Gs1900-48 Firmware	< 2.70\(aahn.0\)-20211208
Zyxel	Gs1900-48hp Firmware	< 2.70\(aaho.0\)-20211208
Zyxel	Gs1900-48hpv2 Firmware	< 2.70\(abtq.0\)-20211208

References

https://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtmlPatch, Vendor Advisory
https://www.zyxel.com/support/Zyxel_security_advisory_for_OS_command_injection_vulnerabilities_of_switches.shtmlPatch, Vendor Advisory

Timeline

Published: Dec 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is 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.

How severe is CVE-2021-35032?

CVE-2021-35032 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35032?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35032?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST