CVE-2026-9387 | A security flaw has been discovered in Totolink A8000RU 7.1c… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-9387
State: PUBLISHED
Assigner: VulDB
Reserved: 2026-05-23 15:03 UTC
Published: 2026-05-24 14:15 UTC
Last updated: 2026-05-26 15:45 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-365350 | Totolink A8000RU Web Management cstecgi.cgi setUpgradeFW os command injection https://vuldb.com/vuln/365350
VDB-365350 | CTI Indicators (IOB, IOC, TTP, IOA) https://vuldb.com/vuln/365350/cti
Submit #813433 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection https://vuldb.com/submit/813433
https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_334/README.md
https://www.totolink.net/