Ubuntu Security Notice 4494-1 - It was discovered that GUPnP incorrectly handled certain subscription requests. A remote attacker could possibly use this issue to exfiltrate data or use GUPnP to perform DDoS attacks.
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The Open Connectivity Foundation UPnP specification before 2020-04-17 does not forbid the acceptance of a subscription request with a delivery URL on a different network segment than the fully qualified event-subscription URL, aka the CallStranger issue. This tool checks for the vulnerability.
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