EUVD-2026-31609
GHSA-rq43-h4ch-33gm
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 vulnerability was detected in Totolink A8000RU 7.1cu.643_b20200521. Affected by this issue is the function setStaticDhcpRules of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. The manipulation of the argument enable results in os command injection. The attack may be performed from remote. The exploit is now public 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 'enable' parameter passed to the setStaticDhcpRules function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists and SSVC rates this as automatable with total technical impact, though EPSS remains modest at 0.89% (76th percentile). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the A8000RU web management interface on firmware 7.1cu.643_b20200521 and the ability to send a request to /cgi-bin/cstecgi.cgi invoking the setStaticDhcpRules function with a malicious 'enable' argument. … 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, score 8.9) indicates a network-reachable, low-complexity, unauthenticated path to full confidentiality, integrity, and availability impact on the vulnerable component, and SSVC corroborates this with Exploitation=poc, Automatable=yes, Technical Impact=total. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans the internet (or an adjacent network) for A8000RU devices exposing /cgi-bin/cstecgi.cgi, then sends a single crafted POST to invoke setStaticDhcpRules with shell metacharacters embedded in the 'enable' argument, causing the CGI to execute attacker-chosen commands as root. The publicly available PoC at https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_340/README.md lowers the skill bar significantly, and because SSVC flags the issue as automatable, the realistic next step is botnet-style mass enrollment (telnet/SSH backdoor, downloader payload, or DNS hijack) rather than targeted intrusion. |
| Remediation | No vendor-released patch identified at time of analysis - neither TOTOLINK nor the VulDB/EUVD references cite a fixed firmware version, so defenders should treat this as unpatched and apply compensating controls. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all TOTOLINK A8000RU routers in your environment, document firmware versions, and audit which devices have internet-accessible management interfaces. …
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External POC / Exploit Code
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