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{"analysis": {"en": {"generated_at": "2026-04-17T21:56:56.201131+00:00", "value": {"mitigation_remediation": ["Apply the latest firmware update that fixes the command injection issue.", "If no update is available, restrict access to the router\u2019s web administration interface to trusted IP addresses or disable remote management.", "Disable the QoS configuration API or block the /goform/set_qos endpoint using a firewall or access control list."], "summary": {"action": "Immediate Patch", "impact": "Remote Command Execution"}, "threat_synthesis": {"affected_systems": "Affected devices are D\u2011Link DIR\u2011823X routers running firmware image 250416. No other firmware revisions are listed as impacted, but the CVE references enumerate this specific build.", "description_and_impact": "The vulnerability resides in the sub_420688 routine of the /goform/set_qos handler in D\u2011Link DIR\u2011823X firmware 250416. An attacker who can send a crafted request to this endpoint can inject arbitrary operating\u2011system commands, leading to full remote code execution on the device. This bypasses input validation (CWE\u201177, CWE\u201178) and compromises confidentiality, integrity, and availability.", "risk_and_exploitability": "The CVSS score of 8.6 indicates a high risk, and although the EPSS score is shown as less than 1%, an exploit has already been publicly released, making the threat real. The vulnerability is not yet listed in the CISA KEV catalog. Attackers can exploit it remotely via the router\u2019s web interface by sending a crafted request to the /goform/set_qos endpoint, bypassing authentication and input validation."}}}}, "created": "2026-02-09T10:39:52.604119+00:00", "updated": "2026-04-17T22:00:11.074810+00:00", "vendors": ["d-link", "d-link$PRODUCT$dir-823x"]}