#VU21043 Cryptographic issues in OpenSSL

Published: 2019-09-11

Vulnerability identifier: #VU21043

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-2019-1547


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Server applications / Encryption software

Vendor: OpenSSL Software Foundation


The vulnerability allows a remote attacker to decrypt traffic.

The vulnerability exists due to insufficient enforcement of side channel resistant code paths. A remote attacker with ability to create a large number of signatures, where explicit parameters with no co-factor is present, can force the application to fall back to non-side channel resistant code pathsduring ECDSA signature operation and perform full key recovery.

Successful exploitation of the vulnerability may allow an attacker to decrypt communication between server and client.

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