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Totolink A7100RU CVE-2026-5853

| EUVD-2026-20868 HIGH
OS Command Injection (CWE-78)
2026-04-09 VulDB GHSA-hh2p-hqf4-c9m6
Command Injection
8.9
CVSS 4.0
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CVSS VectorNVD

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

5
Re-analysis Queued
Apr 27, 2026 - 19:07 vuln.today
cvss_changed
PoC Detected
Apr 09, 2026 - 07:16 vuln.today
Public exploit code
EUVD ID Assigned
Apr 09, 2026 - 07:00 euvd
EUVD-2026-20868
Analysis Generated
Apr 09, 2026 - 07:00 vuln.today
CVE Published
Apr 09, 2026 - 06:30 nvd
HIGH 8.9

DescriptionNVD

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.

AnalysisAI

OS command injection in Totolink A7100RU router version 7.4cu.2313_b20191024 enables unauthenticated remote attackers to execute arbitrary system commands via crafted addrPrefixLen parameter in setIpv6LanCfg function of /cgi-bin/cstecgi.cgi CGI handler. CVSS 9.8 critical severity reflects network-accessible attack vector requiring no privileges or user interaction, with complete confidentiality, integrity, and availability impact. …

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RemediationAI

Within 24 hours: Identify and inventory all Totolik A7100RU routers in production and isolate them from critical network segments if possible; disable remote management interfaces and restrict access to /cgi-bin/cstecgi.cgi to trusted networks only. Within 7 days: Contact Totolik support to confirm whether patched firmware versions are available for this specific model; if available, plan maintenance window for immediate deployment. …

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CVE-2026-5853 vulnerability details – vuln.today
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