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Vulnerability of Snort: data transit via TFO Policy Bypass

Synthesis of the vulnerability 

An attacker can bypass filtering rules via TFO Policy Bypass of Snort, in order to transmit malicious data.
Vulnerable products: Meraki MX***, Snort.
Severity of this weakness: 2/4.
Creation date: 13/01/2021.
Revision date: 31/03/2021.
Références of this bulletin: cisco-sa-snort-tfo-bypass-MmzZrtes, CSCvt43136, CSCvu88532, CVE-2021-1224, VIGILANCE-VUL-34314.

Description of the vulnerability 

An attacker can bypass filtering rules via TFO Policy Bypass of Snort, in order to transmit malicious data.
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This computer threat alert impacts software or systems such as Meraki MX***, Snort.

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

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

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

Solutions for this threat 

Snort: version 2.9.17.
The version 2.9.17 is fixed:
  https://www.snort.org/

Cisco Meraki MX: solution CSCvt43136 CSCvu88532.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt43136
  https://tools.cisco.com/bugsearch/bug/CSCvt43136
  https://tools.cisco.com/quickview/bug/CSCvt43136
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu88532
  https://tools.cisco.com/bugsearch/bug/CSCvu88532
  https://tools.cisco.com/quickview/bug/CSCvu88532
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