Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not implement ciphertext blinding for Elgamal decryption, which allows physically proximate attackers to obtain the server's private key by determining factors using crafted ciphertext and the fluctuations in the electromagnetic field during multiplication.
Exploitability
AV:PAC:HPR:NUI:NScope
S:UImpact
C:HI:NA:N4.2/CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N