CVE-2026-5020 Totolink A3600R Parameter cstecgi.cgi setNoticeCfg command injection

What is CVE-2026-5020?

CVE-2026-5020 is a medium-severity command injection vulnerability in Totolink A3600R, published on 29 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability was detected in Totolink A3600R 4.1.2cu.5182_B20201102. Affected by this issue is the function setNoticeCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument NoticeUrl results in command injection. The attack may be launched remotely. The exploit is now public and may be used.

Weakness: CWE-77, CWE-74

Which versions are affected by CVE-2026-5020?

It affects 1 product.

Products include Totolink A3600r Firmware.

How do I fix CVE-2026-5020?

No fix has been published for CVE-2026-5020 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-5020 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5020 exists.

Other vulnerabilities in Totolink A3600R

• CVE-2026-31027 Memory corruption in n/a Critical 9.8
• CVE-2022-34993 Hardcoded credentials in n/a Critical 9.8
• CVE-2022-25078 Command injection in n/a Critical 9.8
• CVE-2026-1686 Totolink A3600R app.so setAppEasyWizardConfig buffer overflow High 8.7
• CVE-2024-7174 TOTOLINK A3600R cstecgi.cgi setdeviceName buffer overflow High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-98vg-cqgx-463p.