What is CVE-2026-6139?

CVE-2026-6139 is a critical-severity vulnerability in Totolink A7100ru, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-04-13.

How severe is CVE-2026-6139?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Totolink A7100ru

CVE-2026-6139

A vulnerability has been found in Totolink A7100RU 7.4cu.2313_b20191024. This affects the function UploadOpenVpnCert of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument FileName leads to os comm…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.012 (79.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

Totolink A7100ru — versions 7.4cu.2313_b20191024

Weakness classification (CWE)

References

VDB-357003 | Totolink A7100RU CGI cstecgi.cgi UploadOpenVpnCert os command injection (vdb-entry, technical-description)
VDB-357003 | CTI Indicators (IOB, IOC, TTP, IOA) (signature, permissions-required)
Submit #792982 | Totolink A7100RU 7.4cu.2313_b20191024 Command Injection (third-party-advisory)
github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_192/README.md (exploit)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2026-6139?: CVE-2026-6139 is a critical-severity vulnerability in Totolink A7100ru, classified under OS Command Injection. CVSS score: 9.8/10. Published 2026-04-13.
How severe is CVE-2026-6139?: Critical severity. CVSS v3 base score is 9.8 out of 10.