Mercusys AC12G (EU) V1 with firmware AC12G(EU)_V1_200909 returns 128 bytes of uninitialized buffer when receiving POST requests without SOAPAction header on UPnP port 1900, exposing internal memory to unauthenticated adjacent network attackers.
Casky was already ahead
This CVE exploits attack patterns that Casky's 261matched 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-2026-36611 is a memory disclosure vulnerability affecting Mercusys AC12G (EU) routers running firmware version V1_200909. When the UPnP service on port 1900 receives POST requests lacking a SOAPAction header, it returns 128 bytes of uninitialized kernel buffer memory to unauthenticated attackers on the adjacent network. This vulnerability is critical because routers serve as network perimeters, and memory leaks can expose sensitive data including credentials, cryptographic material, or internal state information. Any organization deploying these affected Mercusys devices—particularly in EU regions—faces risk of information disclosure that could lead to lateral movement or credential harvesting by local network adversaries.
Casky's 261 matched skills leverage Claude's extended reasoning to detect the attack patterns mapped to MITRE ATT&CK techniques TA0043 (Reconnaissance) and TA0009 (Collection). Practitioners using Casky would identify suspicious UPnP traffic patterns: specifically, POST requests to port 1900 with missing or malformed SOAPAction headers followed by abnormally sized responses containing non-protocol data. The platform's skill coverage enables detection of the reconnaissance phase where attackers probe for vulnerable UPnP endpoints, and the collection phase where memory disclosure occurs. Security teams would see findings flagging anomalous UPnP payloads, memory access patterns inconsistent with legitimate SOAP operations, and responses containing uninitialized buffer indicators—enabling swift identification and isolation of compromised or vulnerable router instances before data exfiltration occurs.
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These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-36611.
Casky has 261 skills that investigate the attack patterns behind CVE-2026-36611. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →analyzing-campaign-attribution-evidence
threat intelligence · low
analyzing-certificate-transparency-for-phishing
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analyzing-windows-registry-for-artifacts
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auditing-tls-certificate-transparency-logs
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automating-ioc-enrichment
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building-adversary-infrastructure-tracking-system
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detecting-t1548-abuse-elevation-control-mechanism
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evaluating-threat-intelligence-platforms
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exploiting-zerologon-vulnerability-cve-2020-1472
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extracting-credentials-from-memory-dump
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extracting-windows-event-logs-artifacts
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generating-threat-intelligence-reports
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hunting-advanced-persistent-threats
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hunting-for-anomalous-powershell-execution
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hunting-for-beaconing-with-frequency-analysis
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hunting-for-cobalt-strike-beacons
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hunting-for-command-and-control-beaconing
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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-dcom-lateral-movement
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hunting-for-dcsync-attacks
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hunting-for-defense-evasion-via-timestomping
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hunting-for-dns-based-persistence
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hunting-for-dns-tunneling-with-zeek
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hunting-for-domain-fronting-c2-traffic
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hunting-for-lateral-movement-via-wmi
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hunting-for-lolbins-execution-in-endpoint-logs
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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-persistence-mechanisms
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hunting-for-registry-run-key-persistence
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hunting-for-scheduled-task-persistence
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hunting-for-shadow-copy-deletion
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hunting-for-spearphishing-indicators
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hunting-for-startup-folder-persistence
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hunting-for-supply-chain-compromise
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hunting-for-t1098-account-manipulation
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hunting-for-unusual-network-connections
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hunting-for-unusual-service-installations
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hunting-for-webshell-activity
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implementing-conduit-security-for-ot-remote-access
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monitoring-darkweb-sources
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performing-active-directory-bloodhound-analysis
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performing-credential-access-with-lazagne
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performing-http-parameter-pollution-attack
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performing-initial-access-with-evilginx3
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performing-lateral-movement-with-wmiexec
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performing-log-analysis-for-forensic-investigation
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performing-malware-hash-enrichment-with-virustotal
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performing-malware-ioc-extraction
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performing-malware-persistence-investigation
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performing-memory-forensics-with-volatility3
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performing-mobile-device-forensics-with-cellebrite
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performing-network-forensics-with-wireshark
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performing-network-packet-capture-analysis
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performing-nist-csf-maturity-assessment
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performing-second-order-sql-injection
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performing-security-headers-audit
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performing-steganography-detection
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performing-subdomain-enumeration-with-subfinder
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performing-timeline-reconstruction-with-plaso
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processing-stix-taxii-feeds
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profiling-threat-actor-groups
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recovering-deleted-files-with-photorec
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securing-historian-server-in-ot-environment
ot ics security · medium
securing-remote-access-to-ot-environment
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testing-jwt-token-security
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tracking-threat-actor-infrastructure
threat intelligence · low
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