What is CVE-2026-31171?

CVE-2026-31171 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-2026-31171?

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

RCE in Totolink A3300r

CVE-2026-31171

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

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-04-23 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.007 (49.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.007 · change: +0.004

Affected products

Totolink A3300r
Totolink A3300r Firmware — versions 17.0.0cu.557_b20221024

Weakness classification (CWE)

CWE-77 — Command Injection

References

github.com/Svigo-o/TOTOLINK-Vul/tree/main/totolink-a3300r-url-cmd-injection (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-31171?: CVE-2026-31171 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-2026-31171?: Medium severity. CVSS v3 base score is 6.5 out of 10.