CVE-2026-9436 | A flaw has been found in Totolink A8000RU 7.1cu.643_b2020052… | CVSS 9.8 CRITICAL

Description

A flaw has been found in Totolink A8000RU 7.1cu.643_b20200521. The impacted element is the function setL2tpServerCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument enable can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used.

Metadata

CVE ID: CVE-2026-9436
State: PUBLISHED
Assigner: VulDB
Reserved: 2026-05-24 07:07 UTC
Published: 2026-05-25 07:00 UTC
Last updated: 2026-05-28 13:07 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 (6)

VDB-365417 | Totolink A8000RU Web Management cstecgi.cgi setL2tpServerCfg os command injection https://vuldb.com/vuln/365417
VDB-365417 | CTI Indicators (IOB, IOC, TTP, IOA) https://vuldb.com/vuln/365417/cti
Submit #813909 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection https://vuldb.com/submit/813909
Submit #813461 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection (Duplicate) https://vuldb.com/submit/813461
https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_357/README.md
https://www.totolink.net/