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Vulnerability of OpenSSL: Man-in-the-Middle via X509_V_FLAG_X509_STRICT

Synthesis of the vulnerability 

An attacker can act as a Man-in-the-Middle via X509_V_FLAG_X509_STRICT on OpenSSL, in order to read or write data in the session.
Impacted systems: AsyncOS, Nexus by Cisco, NX-OS, Prime Infrastructure, Cisco vEdge, Cisco UCS, Cisco IP Phone, Cisco WSA, Fedora, FreeBSD, hMailServer, Nodejs Core, OpenSSL, Python, RHEL, stunnel, Nessus.
Severity of this alert: 2/4.
Creation date: 25/03/2021.
Références of this alert: CERTFR-2021-AVI-221, CERTFR-2021-AVI-235, cisco-sa-openssl-2021-GHY28dJd, CVE-2021-3450, FEDORA-2021-d049f32a82, FEDORA-2021-f347d1c866, FreeBSD-SA-21:07.openssl, RHSA-2021:1024-01, TNS-2021-05, VIGILANCE-VUL-34943.

Description of the vulnerability 

An attacker can act as a Man-in-the-Middle via X509_V_FLAG_X509_STRICT on OpenSS...
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This security note impacts software or systems such as AsyncOS, Nexus by Cisco, NX-OS, Prime Infrastructure, Cisco vEdge, Cisco UCS, Cisco IP Phone, Cisco WSA, Fedora, FreeBSD, hMailServer, Nodejs Core, OpenSSL, Python, RHEL, stunnel, Nessus.

Our Vigil@nce team determined that the severity of this threat announce is medium.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this computer weakness announce.

Solutions for this threat 

This vulnerability solution will be public soon.
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