#VU21045 Padding oracle attack in OpenSSL

Published: 2019-09-11

Vulnerability identifier: #VU21045

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1563


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Server applications / Encryption software

Vendor: OpenSSL Software Foundation


The vulnerability allows a remote attacker to perform padding oracle attack.

The vulnerability exists due to possibility to perform a Bleichenbacher padding oracle attack against the RSA key, in situations where an attacker receives automated notification of the success or failure of a decryption attempt an attacker. A remote attacker can send 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.

Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 1.1.1 - 1.1.1c, 1.1.0 - 1.1.0k, 1.0.2 - 1.0.2s

External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Latest bulletins with this vulnerability