CVE-2026-7140 | A vulnerability has been found in Totolink A8000RU 7.1cu.643… | CVSS 9.8 CRITICAL

Description

A vulnerability has been found in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument HTTP leads to os command injection. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.

Metadata

CVE ID: CVE-2026-7140
State: PUBLISHED
Assigner: VulDB
Reserved: 2026-04-26 19:30 UTC
Published: 2026-04-27 16:30 UTC
Last updated: 2026-04-27 17:38 UTC
Primary CWE: CWE-78
OS Command Injection
Vendor / Product: Totolink / A8000RU
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Totolink	A8000RU	—	7.1cu.643_b20200521

Weakness (CWE)

CWE	Source	Description
CWE-77	cna	Command Injection
CWE-78	cna	OS Command Injection

CVSS scores (4)

Score	Severity	Version	Source	Vector
10.0	N/D	2.0	cna	AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
9.8	CRITICAL	3.1	cna	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
9.8	CRITICAL	3.0	cna	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
9.3	CRITICAL	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

References (5)

VDB-359739 | Totolink A8000RU CGI cstecgi.cgi CsteSystem os command injection https://vuldb.com/vuln/359739
VDB-359739 | CTI Indicators (IOB, IOC, TTP, IOA) https://vuldb.com/vuln/359739/cti
Submit #801110 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection https://vuldb.com/submit/801110
https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_315/README.md
https://www.totolink.net/