Vulnerability · Published Apr 10, 2026 · Assigned by VulDB

CVE-2026-5994Totolink A7100RU CGI cstecgi.cgi setTelnetCfg 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 1.8% (higher than 79% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.8%top 21.4% 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 issue affects the function setTelnetCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument telnet_enabled results in os command injection. The attack is possible to be carried out 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-356548 | Totolink A7100RU CGI cstecgi.cgi setTelnetCfg os command injection vdb-entry, technical-description
VDB-356548 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #792042 | Totolink A7100RU 7.4cu.2313_b20191024 Command Injection third-party-advisory
https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_166/README.md exploit
https://www.totolink.net/ product