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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "17.0.0cu.557_B20221024"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "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": "2026-04-28T15:09:29.233308+00:00", "value": {"mitigation_remediation": ["Apply any firmware update for the Totolink A3300R that addresses the command injection issue. ", "Configure the router\u2019s firewall or access control lists to restrict HTTP access to /cgi-bin/cstecgi.cgi to trusted IP addresses only. ", "Disable or block external STUN traffic and the stunServerAddr parameter to prevent injection of malicious commands. "], "summary": {"action": "Immediate Patch", "impact": "Remote code execution"}, "threat_synthesis": {"affected_systems": "The vulnerability is present in Totolink A3300R routers running firmware version 17.0.0cu.557_B20221024. No other versions are reported affected. The affected product is the Totolink A3300R, a home\u2011network router.", "description_and_impact": "An OS command injection flaw exists in Totolink A3300R firmware through the stunServerAddr parameter in /cgi-bin/cstecgi.cgi, allowing a remote attacker to execute arbitrary commands. This flaw, classified as CWE\u201178, can compromise confidentiality, integrity, and availability of affected devices because code runs with the device\u2019s privileges. Based on the description, it is inferred that exploitation would compromise those aspects.", "risk_and_exploitability": "The CVSS score of 9.8 indicates critical severity, while the EPSS score of <1% suggests low current exploitation probability, yet the existence of a remote command execution avenue makes it highly damaging if exploited. The vulnerability is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is a remote attacker sending a crafted HTTP request with a malicious stunServerAddr value to the router."}}}}, "created": "2026-04-28T00:00:17.471095+00:00", "title": "Remote Command Execution via STUN Server Address Injection in Totolink A3300R Firmware", "updated": "2026-04-28T15:15:34.205562+00:00", "vendors": ["totolink", "totolink$PRODUCT$a3300r_firmware"]}