Which versions of A7100Ru are affected by CVE-2026-6028?

Totolink A7100RU routers running firmware 7.4cu.2313_b20191024 are vulnerable to unauthenticated remote command injection that permits complete system takeover without user interaction.

Is there a public PoC exploit available for CVE-2026-6028?

Yes, a public proof-of-concept exploit is available for CVE-2026-6028. Prioritise patching immediately. EPSS: 0.9%.

How to fix or mitigate CVE-2026-6028?

Within 24 hours: Identify all Totolik A7100RU devices on network via inventory scan; isolate affected units to separate VLAN or restrict WAN access if replacement is unavailable. Within 7 days: Contact Totolink for available firmware updates beyond 7.4cu.2313_b20191024; evaluate firmware release dates and security advisories for patched versions. Within 30 days: Replace affected routers with patched firmware versions once available from vendor, or substitute with alternative vendor products with confirmed security patches; document all changes and validate network segmentation controls are in place for any interim devices.

A7100Ru CVE-2026-6028

Q: What is the CVSS score of CVE-2026-6028?

CVE-2026-6028 has a CVSS 4.0 base score of 8.9 (High). CVSS vector: 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. EPSS exploitation probability: 0.9%.

EUVD-2026-21322 HIGH

OS Command Injection (CWE-78)

2026-04-10 VulDB

Command Injection TOTOLINK A7100Ru

8.9

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.9 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

Apr 27, 2026 - 19:07 vuln.today

cvss_changed

PoC Detected

Apr 10, 2026 - 07:16 vuln.today

Public exploit code

EUVD ID Assigned

Apr 10, 2026 - 07:00 euvd

EUVD-2026-21322

Analysis Generated

Apr 10, 2026 - 07:00 vuln.today

CVE Published

Apr 10, 2026 - 06:15 nvd

HIGH 8.9

DescriptionCVE.org

A security vulnerability has been detected in Totolink A7100RU 7.4cu.2313_b20191024. Impacted is the function setPptpServerCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument enable leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

AnalysisAI

Remote unauthenticated OS command injection in Totolink A7100RU router firmware 7.4cu.2313_b20191024 enables complete system compromise. Attackers exploit the setPptpServerCfg function in /cgi-bin/cstecgi.cgi CGI handler by injecting malicious commands through the 'enable' parameter. CVSS 9.8 critical severity reflects network-accessible attack requiring no privileges or user interaction. Publicly available exploit code exists, significantly lowering exploitation barrier for remote attackers seeking router takeover, data exfiltration, or network pivoting.

Technical ContextAI

CWE-78 command injection in CGI handler's setPptpServerCfg function. Insufficient input sanitization of the 'enable' parameter permits shell metacharacter injection, executing arbitrary system commands with web server privileges. CVSS vector AV:N/AC:L/PR:N confirms remotely exploitable with no authentication barrier. Affects cpe:2.3:a:totolink:a7100ru firmware handling PPTP server configuration endpoints.

RemediationAI

No vendor-released patch identified at time of analysis. Check Totolink support portal (https://www.totolink.net/) for firmware updates beyond 7.4cu.2313_b20191024. Until patched firmware becomes available, implement network-level access controls: restrict administrative interface access to trusted internal networks only, disable remote management features, and deploy firewall rules blocking external CGI endpoint access on TCP ports 80/443. Consider replacing device if vendor discontinues support. Monitor VulDB advisory https://vuldb.com/vuln/356604 and GitHub POC repository https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_173/README.md for remediation updates. Exploitation likelihood elevated due to publicly available exploit code; prioritize mitigation.