A vulnerability has been found in Tenda F1202 1.2.0.20(408). Affected is the function fromPPTPUserSetting of the file /goform/PPTPUserSetting. Such manipulation of the argument delno leads to stack-based buffer overflow. The attack may be performed from remote. The exploit has been disclosed to the public and may be used.
Casky was already ahead
This CVE exploits attack patterns that Casky's 255matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-9428 is a stack-based buffer overflow vulnerability in the Tenda F1202 wireless router's PPTP user settings functionality. By manipulating the 'delno' parameter in the /goform/PPTPUserSetting endpoint, an unauthenticated remote attacker can overflow a stack buffer and potentially achieve arbitrary code execution. This affects Tenda F1202 version 1.2.0.20(408) and threatens home and small office networks that rely on this router for connectivity, as successful exploitation could grant attackers complete device control, network access, and a foothold for lateral movement into connected systems.
Casky's 255 mapped security skills leverage Claude AI's extended reasoning to detect the attack patterns associated with this vulnerability across MITRE ATT&CK tactics TA0002 (Execution) and TA0003 (Persistence). Practitioners using Casky would observe detection signals aligned with CWE-119 and CWE-121 memory safety violations—including suspicious HTTP POST requests to /goform/PPTPUserSetting with abnormally long 'delno' parameter values, stack canary violations, unexpected process crashes on the router, and post-exploitation artifacts such as new PPTP credentials or reverse shell processes. Claude's reasoning capabilities enable Casky to correlate these indicators with execution chain patterns and persistence mechanisms, helping practitioners differentiate this specific vulnerability exploitation from generic web attacks and prioritize investigation of affected Tenda F1202 devices in their environments.
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These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-9428.
Casky has 255 skills that investigate the attack patterns behind CVE-2026-9428. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →analyzing-browser-forensics-with-hindsight
digital forensics · low
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malware analysis · medium
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digital forensics · low
hardening-docker-containers-for-production
container security · low
hardening-docker-daemon-configuration
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hardening-linux-endpoint-with-cis-benchmark
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hardening-windows-endpoint-with-cis-benchmark
endpoint security · low
hunting-for-anomalous-powershell-execution
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hunting-for-data-exfiltration-indicators
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hunting-for-data-staging-before-exfiltration
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hunting-for-ntlm-relay-attacks
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hunting-for-persistence-mechanisms-in-windows
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hunting-for-persistence-via-wmi-subscriptions
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hunting-for-registry-run-key-persistence
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implementing-alert-fatigue-reduction
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performing-lateral-movement-detection
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