CVE-2019-1563: OpenSSL

Low severity, CVSS 3.7. EPSS: 3.8% chance of exploitation in the next 30 days.

In situations where an attacker receives automated notification of the success or failure of a decryption attempt an attacker, after sending a very large number of messages to be decrypted, can recover a CMS/PKCS7 transported encryption key or decrypt any RSA encrypted message that was encrypted with the public RSA key, using a Bleichenbacher padding oracle attack. Applications are not affected if they use a certificate together with the private RSA key to the CMS_decrypt or PKCS7_decrypt functions to select the correct recipient info to decrypt. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).

Affected products

• OpenSSL OpenSSL: from 1.0.2, up to and including 1.0.2s; from 1.1.0, up to and including 1.1.0k; from 1.1.1, up to and including 1.1.1c

Published 2019-09-10. Last modified 2026-10-08.