CVE-2023-20816: 
NixOS vulnerability analysis and mitigation

CVE-2023-20816 is a medium severity vulnerability discovered in MediaTek's wlan service component. The vulnerability was disclosed on August 7, 2023, affecting various MediaTek chipsets running Android versions 12.0 and 13.0. The issue stems from improper input validation that could lead to an out-of-bounds write condition (MediaTek Bulletin).

The vulnerability is classified as an out-of-bounds write vulnerability due to improper input validation in the wlan service component. It has been assigned a CVSS v3.1 base score of 6.7 (Medium) with the vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. The vulnerability is tracked under CWE-787 (Out-of-bounds Write) (NVD).

A successful exploitation of this vulnerability could lead to local escalation of privilege with System execution privileges. The attack requires no user interaction for exploitation, though system-level privileges are needed to initiate the attack (MediaTek Bulletin).

The vulnerability affects multiple MediaTek chipsets including MT6580, MT6739, MT6761, MT6765, MT6768, MT6779, MT6781, MT6833, MT6853, MT6853T, MT6855, MT6873, MT6875, MT6877, MT6879, MT6883, MT6885, MT6886, MT6889, MT6891, MT6893, MT6895, MT6983, and MT6985. Device manufacturers have been notified and provided with security patches at least two months before the public disclosure (MediaTek Bulletin).