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Rewterz Threat Advisory –Multiple Cisco Products Security Bypass

Severity

Medium

Analysis Summary

CVE-2021-34749

Multiple Cisco Products could allow a remote attacker to bypass security restrictions, caused by inadequate filtering of the SSL handshake. By using data from the SSL client hello packet to communicate with an external server, an attacker could exploit this vulnerability to bypass filtering technology on an affected device and exfiltrate data from a compromised host.

Impact

  • Bypass Security
  • Unauthorized Access

Affected Vendors

Cisco

Affected Products

  • Cisco Integrated Services Virtual Router (ISRv)
  • Cisco 4000 Series ISRs
  • Cisco Cloud Services Router 1000V Series
  • Cisco Meraki Security Appliance

Remediation

Refer to Cisco Security Advisory for the patch, upgrade, By, or suggested workaround information.

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sni-data-exfil-mFgzXqLN

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