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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.1cu.643_b20200521"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "A8000RU", "source": "cna", "vendor": "Totolink"}, "product": "a8000ru", "vendor": "totolink"}], "analysis": {"en": {"generated_at": "2026-04-28T12:52:55.794661+00:00", "value": {"mitigation_remediation": ["Obtain and install the latest firmware update from Totolink that addresses the OS command injection flaw.", "If a patch is not yet available, restrict external access to the /cgi-bin directory by configuring firewall rules or disabling the CGI service through the router\u2019s management interface.", "Avoid using the tty_server parameter or any input that reaches the vulnerable function; as a temporary measure, disallow remote management or disable remote HTTP/HTTPS access until a patch is applied."], "summary": {"action": "Immediate Patch", "impact": "Remote Command Execution"}, "threat_synthesis": {"affected_systems": "The vulnerability is present in the Totolink A8000RU model running firmware 7.1cu.643_b20200521. No other firmware or model variations are listed in the advisory. Users of this specific firmware revision are therefore at risk.", "description_and_impact": "A flaw in the setAdvancedInfoShow function of Totolink A8000RU\u2019s cstecgi.cgi allows an attacker to inject arbitrary OS commands via the tty_server parameter. The vulnerable code does not properly sanitize this input, creating a classic OS command injection weakness (CWE-77 and CWE-78). Compromise of this function grants the attacker full control over the router\u2019s operating system, enabling installation of backdoors, data exfiltration, or service disruption. The CVE\u2019s description notes that the exploit is publicly available and could be leveraged remotely.", "risk_and_exploitability": "The CVSS base score of 9.3 classifies this as critical, reflecting high impact, high exploitability, and network reachability. The EPSS score is not reported, but the public availability of an exploit and the remote nature of the attack suggest a high likelihood of real\u2011world exploitation. The vulnerability is not listed in the CISA KEV catalog, yet its presence in a widely deployed consumer router and the ease of exploitation warrant urgent attention."}}}}, "created": "2026-04-28T00:15:05.299229+00:00", "updated": "2026-04-28T13:00:15.238741+00:00", "vendors": ["totolink", "totolink$PRODUCT$a8000ru"]}