flb_gzip_compress in flb_gzip.c in Fluent Bit before 1.6.4 has an out-of-bounds write because it does not use the correct calculation of the maximum gzip data-size expansion.
track_header in libavformat/vividas.c in FFmpeg 4.3.1 has an out-of-bounds write because of incorrect extradata packing.

Because of COVID, 2020 saw a major shift from working at the “office” to working at home which led to shift the attacks to the user @home. Everything points that 2020 was a year for ransomware and COVID-19 themed campaigns. Without exceptions, phishing emails have been the most prolific initial attack vector targeting organizations and home users. This will likely…
The sellTokenForLRC function in the vault protocol in the smart contract implementation for Loopring (LRC), an Ethereum token, lacks access control for fee swapping and thus allows price manipulation.
The breed function in the smart contract implementation for Farm in Seal Finance (Seal), an Ethereum token, lacks access control and thus allows price manipulation, as exploited in the wild in December 2020 and January 2021.
MyDrivers64.sys in DriverGenius 9.61.3708.3054 allows attackers to cause a system crash via the ioctl command 0x9c402000 to \.MyDrivers0_0_1.
login.php in PHPFusion (aka PHP-Fusion) Andromeda 9.x before 2020-12-30 generates error messages that distinguish between incorrect username and incorrect password (i.e., not a single “Incorrect username or password” message in both cases), which might allow enumeration.
The _deposit function in the smart contract implementation for Stable Yield Credit (yCREDIT), an Ethereum token, has certain incorrect calculations. An attacker can obtain more yCREDIT tokens than they should.
MK-AUTH through 19.01 K4.9 allows remote attackers to obtain sensitive information (e.g., a CPF number) via a modified titulo (aka invoice number) value to the central/recibo.php URI.