CVE-2026-5853: Totolink A7100RU CGI cstecgi.cgi setIpv6LanCfg os command injection

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 13.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-09 · updated 2026-10-26
Weakness: CWE-77

Description

A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument addrPrefixLen leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

Affected products

Totolink A7100RU: 7.4cu.2313_b20191024

References

https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_159/README.md
https://vuldb.com/submit/791274
https://vuldb.com/vuln/356379
https://vuldb.com/vuln/356379/cti
https://www.totolink.net/

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