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CVSS 9.8 · CRITICAL

CVE-2026-7243

A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument maxRtrAdvInterval leads to os command injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.

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Analysis

This is a critical RCE in a specific model of Totolink consumer routers. It is vendor-specific firmware for hardware that is not typically part of the professional software development or server administration stack targeted by this community.

Severity

Score: 9.8(CRITICAL)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV: NETWORK
AC: LOW
PR: NONE
UI: NONE
S: UNCHANGED
C: HIGH
I: HIGH
A: HIGH
Weakness (CWE): CWE-77CWE-78

EPSS

Probability of exploitation (next 30 days): 0.0125 (1.3%)
Percentile: 79.5%
EPSS: 2026-05-06

Technical description

A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setRadvdCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument maxRtrAdvInterval leads to os command injection. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.

Published: 4/28/2026, 9:16:17 AM
Last modified: 4/28/2026, 8:24:20 PM

References

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