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THREATINT
PUBLISHED

CVE-2021-34749

Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability



Assignercisco
Reserved2021-06-15
Published2021-08-18
Updated2024-11-07

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.



MEDIUM: 5.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Product status

Any version
affected

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sni-data-exfil-mFgzXqLN (20210818 Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability) vendor-advisory

https://lists.debian.org/debian-lts-announce/2023/02/msg00011.html ([debian-lts-announce] 20230210 [SECURITY] [DLA 3317-1] snort security update) mailing-list

https://www.debian.org/security/2023/dsa-5354 (DSA-5354) vendor-advisory

cve.org CVE-2021-34749

nvd.nist.gov CVE-2021-34749

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