What is CVE-2026-5851?

CVE-2026-5851 is a critical-severity vulnerability in Totolink A7100ru, classified under Command Injection. CVSS score: 9.8/10. Published 2026-04-09.

How severe is CVE-2026-5851?

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

RCE in Totolink A7100ru

CVE-2026-5851

A security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. This impacts the function setUPnPCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument enable results in os command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.141 (96.2th percentile) — read the EPSS interpretation.

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.

Affected products

Totolink A7100ru — versions 7.4cu.2313_b20191024

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (exploit)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-5851?: CVE-2026-5851 is a critical-severity vulnerability in Totolink A7100ru, classified under Command Injection. CVSS score: 9.8/10. Published 2026-04-09.
How severe is CVE-2026-5851?: Critical severity. CVSS v3 base score is 9.8 out of 10.