This indicates an attack attempt to exploit a Directory Traversal vulnerability in uWSGI PHP Plugin.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted request. A remote attacker may be able to exploit this to read arbitrary files on the system.
uWSGI PHP plugin before 2.0.17
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.