{"id":"CVE-2026-42020","published":"2026-10-20T21:17:19.020","lastModified":"2026-10-22T15:31:24.813","description":"Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup pppoe functionality of Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the pppoe_dns2 parameter.","cvssScore":9.1,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-121"],"vendors":[],"products":[],"references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2026-2394","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"Stack-based buffer overflows in the pppoe_dns2 parameter of the formIpv6Setup function allow authenticated remote code execution on Totolink X2000R routers due to unsafe handling of user-supplied input.","exploitability":"Exploitation requires valid authenticated HTTP access and sending a specially crafted request with an oversized pppoe_dns2 value; high privilege (PR:H) is required, but no user interaction.","blast_radius":"Successful exploitation could lead to full compromise of the router—including loss of confidentiality, integrity, and availability—potentially enabling persistent backdoor access or network-wide lateral movement.","remediation":"Upgrade to firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 or later, as this is the only version explicitly referenced in the description that addresses the vulnerability.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","buffer-overflow","web","firmware","authenticated"],"model":"garnet-coder","analyzedAt":"2026-10-25T08:52:19.720Z"}}