Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.

Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Variant 4.

Cisco ACE XML Gateway (AXG) and ACE Web Application Firewall (WAF) before 6.1 allow remote attackers to obtain sensitive information via an HTTP request that lacks a handler, as demonstrated by (1) an OPTIONS request or (2) a crafted GET request, leading to a Message-handling Errors message containing a certain client intranet IP address, aka Bug ID CSCtb82159.