CVE-2023-45288: exploitation status and patch state
CVE-2023-45288 · CVSS 7.5 HIGH · EPSS 92%
An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.
Is CVE-2023-45288 exploited?
Not in the CISA KEV catalog.
EPSS puts exploitation in the next 30 days at 92%.
Public exploit code: none found in monitored sources.