CVE-2026-5102: Totolink A3300R Parameter cstecgi.cgi setSmartQosCfg command injection

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% 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 security flaw has been discovered in Totolink A3300R 17.0.0cu.557_b20221024. This vulnerability affects the function setSmartQosCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument qos_up_bw results in command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Affected products

Totolink A3300R: 17.0.0cu.557_b20221024

References

https://github.com/Litengzheng/vul_db/blob/main/A3300R/vul_40/README.md
https://vuldb.com/submit/779129
https://vuldb.com/vuln/354127
https://vuldb.com/vuln/354127/cti
https://www.totolink.net/

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