CVE-2026-5994: Totolink A7100RU CGI cstecgi.cgi setTelnetCfg os command injection

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-10 · updated 2026-10-26
Weakness: CWE-77

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

Totolink A7100RU: 7.4cu.2313_b20191024

References

https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_166/README.md
https://vuldb.com/submit/792042
https://vuldb.com/vuln/356548
https://vuldb.com/vuln/356548/cti
https://www.totolink.net/

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