CVE-2026-7538 | A vulnerability was identified in Totolink A8000RU 7.1cu.643… | CVSS 9.8 CRITICAL

Description

A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This issue affects the function Vulnerability of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument proto leads to os command injection. The attack may be initiated remotely. The exploit is publicly available and might be used.

Metadata

CVE ID: CVE-2026-7538
State: PUBLISHED
Assigner: VulDB
Reserved: 2026-04-30 18:22 UTC
Published: 2026-05-01 01:30 UTC
Last updated: 2026-05-01 14:14 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-360354 | Totolink A8000RU CGI cstecgi.cgi vulnerability os command injection https://vuldb.com/vuln/360354
VDB-360354 | CTI Indicators (IOB, IOC, TTP, IOA) https://vuldb.com/vuln/360354/cti
Submit #804321 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection https://vuldb.com/submit/804321
https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_329/README.md
https://www.totolink.net/