Vulnerability Monitor

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CVE-2021-34749

A vulnerability in Server Name Identification (SNI) request filtering of Cisco Web Security Appliance (WSA), Cisco Firepower Threat Defense (FTD), and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from a compromised host. This vulnerability is due to inadequate filtering of the SSL handshake. An attacker could exploit this vulnerability by using data from the SSL client hello packet to communicate with an external server. A successful exploit could allow the attacker to execute a command-and-control attack on a compromised host and perform additional data exfiltration attacks.

Published

2021-08-18T20:15:07.930

Last Modified

2024-11-26T16:09:02.407

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.8 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:P/A:N

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: PARTIAL
  • Availability Impact: NONE
Exploitability Score

10.0

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-200
  • Type: Primary
    CWE-200
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application cisco ironport_web_security_appliance 14.5 Yes
Application cisco secure_firewall_management_center 2.9.18 Yes
Operating System cisco firepower_management_center_virtual_appliance_firmware 6.6.0 Yes
Operating System cisco firepower_management_center_virtual_appliance_firmware 6.7.0 Yes
Operating System cisco firepower_management_center_virtual_appliance_firmware 7.0.0 Yes
Operating System cisco firepower_management_center_virtual_appliance_firmware 7.1.0 Yes
References