CVE-2020-13410: 
JavaScript vulnerability analysis and mitigation

A Denial of Service (DoS) vulnerability was discovered in MoscaJS Aedes version 0.42.0, identified as CVE-2020-13410. The vulnerability exists in lib/write.js due to improper handling of exceptions during the writing of packets (Payatu Advisory).

The vulnerability occurs when a specifically crafted payload with published header and message length set to 0 is sent to the server. The issue arises in the writeNumberCached function while attempting to create a packet for Publish Release. The operation fails at stream.write() as the datatype becomes an undefined array with -1 number (the packet id of the packet), leading to improper error handling (Payatu Advisory).

When exploited, this vulnerability can cause the MQTT broker server to crash, resulting in a denial of service condition. This affects the availability of the MQTT broker service (Payatu Advisory).

The vulnerability can be triggered by sending a maliciously crafted payload to the MQTT broker. The attack can be initiated remotely, requiring minimal interaction from the attacker (Payatu Advisory).

The vulnerability has been fixed in a pull request that implements proper error handling for writeToStream errors. Users should upgrade to the version containing the fix. The fix was implemented through GitHub pull request #493 (GitHub PR).