CVE-2024-21639

CVE-2024-21639 is a critical out-of-bounds read vulnerability affecting the Chromium Embedded Framework (CEF), specifically within the CefLayeredWindowUpdaterOSR::OnAllocatedSharedMemory function, due to a lack of shared memory size validation. This flaw allows an attacker to read data outside of the intended memory region, potentially bypassing the sandbox. With a CVSS score of 9.6 (CRITICAL), it presents a high severity risk with a network attack vector, low attack complexity, and high impact on confidentiality and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.