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CVE-2021-34749
CVE ID
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CVE-2021-34749
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
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.
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CVSS V3 Severity and Metrics
General Information
Vendors
- cisco
Products
- firepower management center 2.9.18,
- firepower management center virtual appliance firmware 6.6.0,
- firepower management center virtual appliance firmware 6.7.0,
- firepower management center virtual appliance firmware 7.0.0,
- firepower management center virtual appliance firmware 7.1.0,
- ironport web security appliance 14.5
References
Advisory
Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
AttackerKB requires a CVE ID in order to pull vulnerability data and references from the CVE list and the National Vulnerability Database. If available, please supply below:
