CVE-2020-20950: IETF Public Key Cryptography Standards #1

Medium severity, CVSS 5.9. EPSS: 0.9% chance of exploitation in the next 30 days.

Bleichenbacher's attack on PKCS #1 v1.5 padding for RSA in Microchip Libraries for Applications 2018-11-26 All up to 2018-11-26. The vulnerability can allow one to use Bleichenbacher's oracle attack to decrypt an encrypted ciphertext by making successive queries to the server using the vulnerable library, resulting in remote information disclosure.

Affected products

• IETF Public Key Cryptography Standards #1: version 1.5 only
• Microchip Microchip Libraries For Applications: up to and including 2018-11-26

Published 2021-01-19. Last modified 2026-07-09.