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.
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:cisco:firepower_management_center:2.9.18:*:*:*:*:*:*:*
cpe:2.3:a:cisco:ironport_web_security_appliance:14.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.6.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.7.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.0.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.1.0:*:*:*:*:*:*:*

History

19 Feb 2023, 04:15

Type Values Removed Values Added
References
  • (MLIST) https://lists.debian.org/debian-lts-announce/2023/02/msg00011.html -
  • (DEBIAN) https://www.debian.org/security/2023/dsa-5354 -

25 Aug 2021, 19:11

Type Values Removed Values Added
CPE cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.1.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:ironport_web_security_appliance:14.5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.6.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:firepower_management_center_virtual_appliance_firmware:6.7.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_management_center:2.9.18:*:*:*:*:*:*:*
CWE CWE-200
CVSS v2 : unknown
v3 : unknown
v2 : 5.0
v3 : 8.6
References (CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sni-data-exfil-mFgzXqLN - (CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sni-data-exfil-mFgzXqLN - Patch, Vendor Advisory

18 Aug 2021, 20:15

Type Values Removed Values Added
New CVE

Information

Published : 2021-08-18 20:15

Updated : 2024-02-04 21:47


NVD link : CVE-2021-34749

Mitre link : CVE-2021-34749

CVE.ORG link : CVE-2021-34749


JSON object : View

Products Affected

cisco

  • firepower_management_center
  • ironport_web_security_appliance
  • firepower_management_center_virtual_appliance_firmware
CWE
CWE-200

Exposure of Sensitive Information to an Unauthorized Actor