EUVD-2026-31610
GHSA-372j-76g5-g2rh
Severity by source
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
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
Lifecycle Timeline
3DescriptionCVE.org
A security vulnerability has been detected in Totolink A8000RU 7.1cu.643_b20200521. Affected by this vulnerability is the function setFirewallType of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. The manipulation of the argument firewallType leads to os command injection. The attack is possible to be carried out remotely. The exploit has been disclosed publicly and may be used.
AnalysisAI
OS command injection in the Totolink A8000RU router (firmware 7.1cu.643_b20200521) allows remote unauthenticated attackers to execute arbitrary operating system commands by manipulating the firewallType parameter sent to /cgi-bin/cstecgi.cgi. Publicly available exploit code exists, and the SSVC framework rates the technical impact as total with automatable exploitation, though it is not currently listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The device must be a Totolink A8000RU running firmware 7.1cu.643_b20200521 with the Web Management Interface (cstecgi.cgi) reachable by the attacker; no authentication, user interaction, or non-default configuration is required per CVSS 4.0 PR:N/UI:N/AC:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) confirms a network-reachable, low-complexity, unauthenticated attack yielding full confidentiality, integrity, and availability compromise, scoring 8.9. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans the internet for Totolink A8000RU devices exposing /cgi-bin/cstecgi.cgi on the WAN interface, then sends a single crafted HTTP request to the setFirewallType endpoint with shell metacharacters injected into the firewallType parameter, achieving command execution as the web server user (typically root on embedded routers). Because a public POC is available on GitHub (Litengzheng/vuldb_new2) and SSVC marks the attack as automatable, mass scanning and botnet recruitment (e.g., Mirai-style) are realistic outcomes for any exposed device. |
| Remediation | No vendor-released patch identified at time of analysis - Totolink has not published a security advisory or firmware update for this issue in the provided references. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Totolik A8000RU routers running firmware 7.1cu.643_b20200521 or earlier versions; document network location and access controls. …
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External POC / Exploit Code
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