The php_binary serialization handler in the session extension in PHP before 4.4.5, and 5.x before 5.2.1, allows context-dependent attackers to obtain sensitive information (memory contents) via a serialized variable entry with a large length value, which triggers a buffer over-read.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.114
EPSS Ranking 93.3%