#VU71993 Information Exposure Through Timing Discrepancy in OpenSSL

Published: 2023-02-07 | Updated: 2024-01-05

Vulnerability identifier: #VU71993

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-4304


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Server applications / Encryption software

Vendor: OpenSSL Software Foundation


The vulnerability allows a remote attacker to obtain sensitive information.

The vulnerability exists due to a timing based side channel exists in the OpenSSL RSA Decryption implementation. A remote attacker can perform a Bleichenbacher style attack and decrypt data sent over the network.

To achieve a successful decryption an attacker would have to be able to send a very large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP and RSASVE.

Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 3.0.0 - 3.0.7, 1.1.1 - 1.1.1s, 1.0.2 - 1.0.2zf, 1.1.0 - 1.1.0l, 1.0.0 - 1.0.0t, 1.0.1 - 1.0.1u

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