CVE-2026-5994 | A security flaw has been discovered in Totolink A7100RU 7.4c… | CVSS 9.8 CRITICAL

Description

A security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. This issue affects the function setTelnetCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument telnet_enabled results in os command injection. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.

Metadata

CVE ID: CVE-2026-5994
State: PUBLISHED
Assigner: VulDB
Reserved: 2026-04-09 12:49 UTC
Published: 2026-04-10 00:30 UTC
Last updated: 2026-04-10 17:06 UTC
Primary CWE: CWE-78
OS Command Injection
Vendor / Product: Totolink / A7100RU
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	A7100RU	—	7.4cu.2313_b20191024

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-356548 | Totolink A7100RU CGI cstecgi.cgi setTelnetCfg os command injection https://vuldb.com/vuln/356548
VDB-356548 | CTI Indicators (IOB, IOC, TTP, IOA) https://vuldb.com/vuln/356548/cti
Submit #792042 | Totolink A7100RU 7.4cu.2313_b20191024 Command Injection https://vuldb.com/submit/792042
https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_166/README.md
https://www.totolink.net/