5.8
Medium
CVE-2021-34749 A vulnerability in Server Name Identification (SNI) request filtering of Cisco Web Security Appliance (WSA), Cisco…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Web Security Appliance (WSA) | Versions not published |
References
- 20210818 Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability tools.cisco.com
- [debian-lts-announce] 20230210 [SECURITY] [DLA 3317-1] snort security update lists.debian.org
- DSA-5354 www.debian.org
Timeline
- Published
- Last modified
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