The iconv() function in the GNU C Library versions 2.39 and older may overflow the output buffer passed to it by up to 4 bytes when converting strings to the ISO-2022-CN-EXT character set, which may be used to crash an application or overwrite a neighbouring variable.
Exploitability
AV:LAC:LPR:NUI:NScope
S:UImpact
C:LI:LA:H7.3/CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HMemory Safety