CVE-2026-5853 | A security vulnerability has been detected in Totolink A7100… | CVSS 9.8 CRITICAL

Description

A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Affected by this vulnerability is the function setIpv6LanCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Such manipulation of the argument addrPrefixLen leads to os command injection. The attack may be performed from remote. The exploit has been disclosed publicly and may be used.

Metadata

CVE ID: CVE-2026-5853
State: PUBLISHED
Assigner: VulDB
Reserved: 2026-04-08 19:20 UTC
Published: 2026-04-09 06:30 UTC
Last updated: 2026-04-09 14:47 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-356379 | Totolink A7100RU CGI cstecgi.cgi setIpv6LanCfg os command injection https://vuldb.com/vuln/356379
VDB-356379 | CTI Indicators (IOB, IOC, TTP, IOA) https://vuldb.com/vuln/356379/cti
Submit #791274 | Totolink A7100RU 7.4cu.2313_b20191024 Command Injection https://vuldb.com/submit/791274
https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_159/README.md
https://www.totolink.net/