Cyber Resilience

CVE-2026-31176

MediumPublic PoC

Published: 23 April 2026

Published
23 April 2026
Modified
24 April 2026
KEV Added
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Patch
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CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS Score 0.0039 60.3th percentile
Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-31176 is a medium-severity Command Injection (CWE-77) vulnerability in Totolink A3300R Firmware. Its CVSS base score is 6.5 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 39.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-77

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

Command injection in public web CGI directly enables remote exploitation of the application for arbitrary Unix command execution.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

Affected Assets

totolink
a3300r firmware
17.0.0cu.557_b20221024

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References