What is CVE-2026-31166?

CVE-2026-31166 is a medium-severity vulnerability in Totolink A3300r, classified under Command Injection. CVSS score: 6.5/10. Published 2026-04-23.

How severe is CVE-2026-31166?

Medium severity. CVSS v3 base score is 6.5 out of 10.

RCE in Totolink A3300r

CVE-2026-31166

An issue was discovered in ToToLink A3300R firmware v17.0.0cu.557_B20221024 allowing attackers to execute arbitrary commands via the hour parameter to /cgi-bin/cstecgi.cgi.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.003 (19.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Totolink A3300r
Totolink A3300r_firmware — versions 17.0.0cu.557_b20221024
N/a — versions n/a

Weakness classification (CWE)

CWE-77 — Command Injection

References

cve@mitre.org (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-31166?: CVE-2026-31166 is a medium-severity vulnerability in Totolink A3300r, classified under Command Injection. CVSS score: 6.5/10. Published 2026-04-23.
How severe is CVE-2026-31166?: Medium severity. CVSS v3 base score is 6.5 out of 10.