Tenable.sc versions 5.14.0 through 5.19.1 were found to contain a remote code execution vulnerability which could allow a remote, unauthenticated attacker to execute code under special circumstances. An attacker would first have to stage a specific file type in the web server root of the Tenable.sc host prior to remote exploitation.
In Expat (aka libexpat) before 2.4.3, a left shift by 29 (or more) places in the storeAtts function in xmlparse.c can lead to realloc misbehavior (e.g., allocating too few bytes, or only freeing memory).
A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).