CVE-2026-5103: Totolink A3300R cstecgi.cgi setUPnPCfg command injection

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-30 · updated 2026-06-17
Weakness: CWE-74

Description

A weakness has been identified in Totolink A3300R 17.0.0cu.557_b20221024. This issue affects the function setUPnPCfg of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument enable causes command injection. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

Affected products

Totolink A3300R: 17.0.0cu.557_b20221024

References

https://github.com/LvHongW/Vuln-of-totolink_A3300R/tree/main/A3300R_enable_cmd_inject
https://vuldb.com/submit/779140
https://vuldb.com/vuln/354128
https://vuldb.com/vuln/354128/cti
https://www.totolink.net/

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