Vulnerability · Published Apr 9, 2026 · Assigned by VulDB

CVE-2026-5851Totolink A7100RU CGI cstecgi.cgi setUPnPCfg os command injection

Critical 9.8

In plain English

A critical-severity OS command injection in A7100RU from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 13.6% (higher than 96% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)13.6%top 3.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Totolink	A7100RU	7.4cu.2313_b20191024

Weakness: CWE-78, CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-356377 | Totolink A7100RU CGI cstecgi.cgi setUPnPCfg os command injection vdb-entry, technical-description
VDB-356377 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #791271 | Totolink A7100RU 7.4cu.2313_b20191024 Command Injection third-party-advisory
https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_157/README.md exploit
https://www.totolink.net/ product