CVE-2026-9387

CRITICAL

Totolink A8000RU Web Management cstecgi.cgi setUpgradeFW os command injection

Title source: cna

Description

A security flaw has been discovered in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument resetFlags results in os command injection. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

References (5)

Core 5

Core References

Vdb Entry, Technical Description vdb-entry technical-description

VDB-365350 | Totolink A8000RU Web Management cstecgi.cgi setUpgradeFW os command injection

https://vuldb.com/vuln/365350

Signature, Permissions Required signature permissions-required

VDB-365350 | CTI Indicators (IOB, IOC, TTP, IOA)

https://vuldb.com/vuln/365350/cti

Third Party Advisory third-party-advisory

Submit #813433 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection

https://vuldb.com/submit/813433

Exploit exploit

https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_334/README.md

View Exploit ZIP pw:eip

Product product

https://www.totolink.net/

Scores

CVSS v3 9.8

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

Details

CWE

CWE-77 CWE-78

Status published

Products (1)

Totolink/A8000RU 7.1cu.643_b20200521

Published May 24, 2026

Tracked Since May 24, 2026