CVE-2019-11778: eclipse mosquitto Use After Free

Vulnerability summary

CVE-2019-11778 is a medium (CVSS 5.5) Use After Free vulnerability in eclipse mosquitto. EPSS estimates a 0.76% chance of exploitation in the next 30 days, higher than 54.5% of scored vulnerabilities.

Timeline

1. 18-09-2019
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

If an MQTT v5 client connects to Eclipse Mosquitto versions 1.6.0 to 1.6.4 inclusive, sets a last will and testament, sets a will delay interval, sets a session expiry interval, and the will delay interval is set longer than the session expiry interval, then a use after free error occurs, which has the potential to cause a crash in some situations.

• CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.