CVE-2026-31179

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.0.0cu.557_B20221024"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "a3300r_firmware", "vendor": "totolink"}], "analysis": {"en": {"generated_at": "2026-04-28T15:09:57.349166+00:00", "value": {"mitigation_remediation": ["Update the device to a firmware version that removes the vulnerable stunPort handling or otherwise fixes the command injection issue. If a patch is not yet available, block or disable access to the /cgi-bin/cstecgi.cgi CGI script by configuring the router\u2019s firewall or access control lists to limit the endpoint to trusted internal IP addresses.", "Restrict or disable the STUN port functionality in the router\u2019s settings, which removes the attack vector altogether. This can be achieved by setting the stunPort value to a null or invalid state via the router\u2019s configuration interface.", "Configure network perimeter devices or a local firewall to block inbound traffic to the router\u2019s web management interface from untrusted networks, and audit the web server logs regularly for abnormal CGI invocation patterns."], "summary": {"action": "Apply Patch", "impact": "Remote Command Execution"}, "threat_synthesis": {"affected_systems": "Affected devices are TOTOLINK routers of the A3300R model running firmware version 17.0.0cu.557_B20221024. No product variations are listed beyond this firmware build, so any device identified by the CPE strings provided is likely vulnerable.", "description_and_impact": "The TOTOLINK A3300R firmware contains a command\u2011injection flaw that can be triggered by supplying an arbitrary string to the stunPort parameter in the /cgi-bin/cstecgi.cgi endpoint. This allows an attacker to run arbitrary commands under the privileges of the router\u2019s web daemon, potentially leading to full device compromise. The weakness is a classic instance of CWE\u201177 (Command Injection).", "risk_and_exploitability": "The CVSS score of 6.5 reflects a moderate severity, and the EPSS score of less than 1% indicates that real\u2011world exploitation is considered unlikely at this time. The vulnerability is not listed in CISA\u2019s KEV catalog. Based on the description, it is inferred that attackers would require network access to the router\u2019s internal interface, typically from a local or compromised network segment. Based on the description, it is inferred that the exploit requires no special privileges beyond reaching the web service, and it could be performed by sending a crafted HTTP request to the exposed /cgi-bin/cstecgi.cgi endpoint."}}}}, "created": "2026-04-28T00:00:17.471596+00:00", "title": "Command Injection through STUN Port Parameter in TOTOLINK A3300R Firmware", "updated": "2026-04-28T15:15:34.207655+00:00", "vendors": ["totolink", "totolink$PRODUCT$a3300r_firmware"]}