A vulnerability was determined in Yealink SIP-T46U 108.86.0.118. Affected is the function mod_webd.BlueToothTest of the file /api/inner/bttest of the component Web FastCGI Service. Executing a manipulation of the argument btMac/pin/reserved can lead to stack-based buffer overflow. The attack needs to be done within the local network. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
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-2026-12222 exploits a stack-based buffer overflow in the Yealink SIP-T46U phone's Web FastCGI Service, specifically in the mod_webd.BlueToothTest function handling Bluetooth configuration parameters. An attacker on the local network can manipulate btMac, pin, or reserved arguments to overflow the stack and execute arbitrary code with device privileges. This vulnerability is particularly concerning for enterprises deploying Yealink phones in office environments, as it requires only network proximity—not authentication—and provides a foothold for lateral movement within corporate infrastructure. With CVSS 8.0 severity and public exploit disclosure, this represents an immediate risk to organizations running affected firmware versions (108.86.0.118 and potentially others) despite the vendor's unresponsiveness to early disclosure.
Casky's 255 mapped security skills leverage Claude's extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK techniques TA0002 (Execution) and TA0003 (Persistence). Practitioners would observe detection findings related to abnormal Web FastCGI service requests with oversized or malformed Bluetooth parameters, suspicious memory write patterns targeting stack regions, and potential shellcode indicators in HTTP request payloads directed at /api/inner/bttest endpoints. The platform correlates CWE-119 and CWE-121 (buffer overflow variants) with behavioral signals—such as process crashes, unexpected privilege escalation attempts post-compromise, or unusual device configuration changes—enabling practitioners to distinguish genuine exploitation attempts from benign network traffic and prioritize remediation on vulnerable SIP-T46U devices.
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These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-12222.
Casky has 255 skills that investigate the attack patterns behind CVE-2026-12222. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →analyzing-browser-forensics-with-hindsight
digital forensics · low
analyzing-cobalt-strike-beacon-configuration
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analyzing-cobaltstrike-malleable-c2-profiles
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analyzing-dns-logs-for-exfiltration
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digital forensics · low
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digital forensics · low
analyzing-golang-malware-with-ghidra
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analyzing-linux-system-artifacts
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digital forensics · low
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soc operations · low
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analyzing-windows-prefetch-with-python
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digital forensics · low
analyzing-windows-shellbag-artifacts
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building-automated-malware-submission-pipeline
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building-incident-response-dashboard
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conducting-spearphishing-simulation-campaign
red teaming · high
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endpoint security · low
configuring-windows-defender-advanced-settings
endpoint security · low
configuring-windows-event-logging-for-detection
endpoint security · low
correlating-security-events-in-qradar
soc operations · low
deobfuscating-javascript-malware
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endpoint security · low
deploying-osquery-for-endpoint-monitoring
endpoint security · low
detecting-container-drift-at-runtime
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detecting-container-escape-attempts
container security · low
detecting-container-escape-with-falco-rules
container security · low
detecting-dcsync-attack-in-active-directory
threat hunting · low
detecting-dll-sideloading-attacks
threat hunting · low
detecting-email-forwarding-rules-attack
threat hunting · low
detecting-evasion-techniques-in-endpoint-logs
endpoint security · low
detecting-fileless-attacks-on-endpoints
endpoint security · low
detecting-fileless-malware-techniques
malware analysis · medium
detecting-golden-ticket-attacks-in-kerberos-logs
threat hunting · low
detecting-insider-threat-behaviors
threat hunting · low
detecting-kerberoasting-attacks
threat hunting · low
detecting-lateral-movement-with-splunk
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detecting-malicious-scheduled-tasks-with-sysmon
threat hunting · low
detecting-mimikatz-execution-patterns
threat hunting · low
detecting-ntlm-relay-with-event-correlation
threat hunting · low
detecting-pass-the-hash-attacks
threat hunting · low
detecting-privilege-escalation-attempts
threat hunting · low
detecting-privilege-escalation-in-kubernetes-pods
container security · low
detecting-process-hollowing-technique
threat hunting · low
detecting-process-injection-techniques
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detecting-rootkit-activity
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detecting-suspicious-powershell-execution
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detecting-t1003-credential-dumping-with-edr
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detecting-t1055-process-injection-with-sysmon
threat hunting · low
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threat hunting · low
detecting-wmi-persistence
threat hunting · low
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red teaming · high
exploiting-constrained-delegation-abuse
red teaming · high
exploiting-kerberoasting-with-impacket
red teaming · high
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red teaming · high
exploiting-nopac-cve-2021-42278-42287
red teaming · high
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penetration testing · medium
exploiting-zerologon-vulnerability-cve-2020-1472
red teaming · high
extracting-browser-history-artifacts
digital forensics · low
extracting-config-from-agent-tesla-rat
malware analysis · medium
extracting-credentials-from-memory-dump
digital forensics · low
extracting-iocs-from-malware-samples
malware analysis · medium
extracting-windows-event-logs-artifacts
digital forensics · low
hardening-docker-containers-for-production
container security · low
hardening-docker-daemon-configuration
container security · low
hardening-linux-endpoint-with-cis-benchmark
endpoint security · low
hardening-windows-endpoint-with-cis-benchmark
endpoint security · low
hunting-for-anomalous-powershell-execution
threat hunting · low
hunting-for-beaconing-with-frequency-analysis
threat hunting · low
hunting-for-cobalt-strike-beacons
threat hunting · low
hunting-for-command-and-control-beaconing
threat hunting · low
hunting-for-data-exfiltration-indicators
threat hunting · low
hunting-for-data-staging-before-exfiltration
threat hunting · low
hunting-for-dcom-lateral-movement
threat hunting · low
hunting-for-dcsync-attacks
threat hunting · low
hunting-for-defense-evasion-via-timestomping
threat hunting · low
hunting-for-dns-based-persistence
threat hunting · low
hunting-for-dns-tunneling-with-zeek
threat hunting · low
hunting-for-domain-fronting-c2-traffic
threat hunting · low
hunting-for-lateral-movement-via-wmi
threat hunting · low
hunting-for-living-off-the-cloud-techniques
threat hunting · low
hunting-for-living-off-the-land-binaries
threat hunting · low
hunting-for-lolbins-execution-in-endpoint-logs
threat hunting · low
hunting-for-ntlm-relay-attacks
threat hunting · low
hunting-for-persistence-mechanisms-in-windows
threat hunting · low
hunting-for-persistence-via-wmi-subscriptions
threat hunting · low
hunting-for-process-injection-techniques
threat hunting · low
hunting-for-registry-persistence-mechanisms
threat hunting · low
hunting-for-registry-run-key-persistence
threat hunting · low
hunting-for-scheduled-task-persistence
threat hunting · low
hunting-for-shadow-copy-deletion
threat hunting · low
hunting-for-spearphishing-indicators
threat hunting · low
hunting-for-startup-folder-persistence
threat hunting · low
hunting-for-supply-chain-compromise
threat hunting · low
hunting-for-suspicious-scheduled-tasks
threat hunting · low
hunting-for-t1098-account-manipulation
threat hunting · low
hunting-for-unusual-network-connections
threat hunting · low
hunting-for-unusual-service-installations
threat hunting · low
hunting-for-webshell-activity
threat hunting · low
implementing-alert-fatigue-reduction
soc operations · low
implementing-application-whitelisting-with-applocker
endpoint security · low
implementing-container-image-minimal-base-with-distroless
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implementing-container-network-policies-with-calico
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implementing-disk-encryption-with-bitlocker
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implementing-endpoint-dlp-controls
endpoint security · low
implementing-file-integrity-monitoring-with-aide
endpoint security · low
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implementing-kubernetes-pod-security-standards
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implementing-memory-protection-with-dep-aslr
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implementing-mitre-attack-coverage-mapping
soc operations · low
implementing-network-policies-for-kubernetes
container security · low
implementing-opa-gatekeeper-for-policy-enforcement
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implementing-pod-security-admission-controller
container security · low
implementing-rbac-hardening-for-kubernetes
container security · low
implementing-runtime-security-with-tetragon
container security · low
implementing-siem-use-cases-for-detection
soc operations · low
implementing-soar-automation-with-phantom
soc operations · low
implementing-soar-playbook-with-palo-alto-xsoar
soc operations · low
implementing-supply-chain-security-with-in-toto
container security · low
implementing-threat-modeling-with-mitre-attack
soc operations · low
implementing-ticketing-system-for-incidents
soc operations · low
implementing-usb-device-control-policy
endpoint security · low
investigating-insider-threat-indicators
soc operations · low
investigating-phishing-email-incident
soc operations · low
investigating-ransomware-attack-artifacts
digital forensics · low
performing-active-directory-bloodhound-analysis
red teaming · high
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performing-cloud-storage-forensic-acquisition
digital forensics · low
performing-container-escape-detection
container security · low
performing-container-security-scanning-with-trivy
container security · low
performing-credential-access-with-lazagne
red teaming · high
performing-deception-technology-deployment
soc operations · low
performing-docker-bench-security-assessment
container security · low
performing-dynamic-analysis-with-any-run
malware analysis · medium
performing-endpoint-forensics-investigation
endpoint security · low
performing-endpoint-vulnerability-remediation
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performing-external-network-penetration-test
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performing-false-positive-reduction-in-siem
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performing-file-carving-with-foremost
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performing-firmware-malware-analysis
malware analysis · medium
performing-initial-access-with-evilginx3
red teaming · high
performing-ioc-enrichment-automation
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performing-iot-security-assessment
penetration testing · medium
performing-kerberoasting-attack
red teaming · high
performing-kubernetes-cis-benchmark-with-kube-bench
container security · low
performing-kubernetes-etcd-security-assessment
container security · low
performing-kubernetes-penetration-testing
container security · low
performing-lateral-movement-detection
soc operations · low
performing-lateral-movement-with-wmiexec
red teaming · high
performing-linux-log-forensics-investigation
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performing-log-analysis-for-forensic-investigation
digital forensics · low
performing-log-source-onboarding-in-siem
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performing-malware-persistence-investigation
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performing-malware-triage-with-yara
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performing-memory-forensics-with-volatility3
digital forensics · low
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performing-mobile-device-forensics-with-cellebrite
digital forensics · low
performing-network-forensics-with-wireshark
digital forensics · low
performing-network-packet-capture-analysis
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performing-open-source-intelligence-gathering
red teaming · high
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performing-static-malware-analysis-with-pe-studio
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performing-steganography-detection
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performing-threat-hunting-with-yara-rules
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performing-timeline-reconstruction-with-plaso
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performing-vulnerability-scanning-with-nessus
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digital forensics · low
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performing-yara-rule-development-for-detection
malware analysis · medium
recovering-deleted-files-with-photorec
digital forensics · low
reverse-engineering-android-malware-with-jadx
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reverse-engineering-dotnet-malware-with-dnspy
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reverse-engineering-malware-with-ghidra
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reverse-engineering-ransomware-encryption-routine
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scanning-container-images-with-grype
container security · low
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container security · low
scanning-kubernetes-manifests-with-kubesec
container security · low
securing-container-registry-with-harbor
container security · low
securing-helm-chart-deployments
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testing-for-xss-vulnerabilities
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triaging-security-alerts-in-splunk
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