CVE-2021-34793

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Summary

CVECVE-2021-34793
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-10-27 19:15:00 UTC
Updated2023-11-07 03:36:00 UTC
DescriptionA vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent mode could allow an unauthenticated, remote attacker to poison MAC address tables, resulting in a denial of service (DoS) vulnerability. This vulnerability is due to incorrect handling of certain TCP segments when the affected device is operating in transparent mode. An attacker could exploit this vulnerability by sending a crafted TCP segment through an affected device. A successful exploit could allow the attacker to poison the MAC address tables in adjacent devices, resulting in network disruption.

Risk And Classification

Problem Types: CWE-924

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cisco Adaptive Security Appliance All All All All
Operating System Cisco Adaptive Security Appliance Software All All All All
Hardware Cisco Asa 5505 - All All All
Operating System Cisco Asa 5505 Firmware 009.008\(004.025\) All All All
Hardware Cisco Asa 5512-x - All All All
Operating System Cisco Asa 5512-x Firmware 009.008\(004.025\) All All All
Hardware Cisco Asa 5515-x - All All All
Operating System Cisco Asa 5515-x Firmware 009.008\(004.025\) All All All
Hardware Cisco Asa 5525-x - All All All
Operating System Cisco Asa 5525-x Firmware 009.008\(004.025\) All All All
Hardware Cisco Asa 5545-x - All All All
Operating System Cisco Asa 5545-x Firmware 009.008\(004.025\) All All All
Hardware Cisco Asa 5555-x - All All All
Operating System Cisco Asa 5555-x Firmware 009.008\(004.025\) All All All
Hardware Cisco Asa 5580 - All All All
Operating System Cisco Asa 5580 Firmware 009.008\(004.025\) All All All
Hardware Cisco Asa 5585-x - All All All
Operating System Cisco Asa 5585-x Firmware 009.008\(004.025\) All All All
Application Cisco Firepower Threat Defense All All All All

References

ReferenceSourceLinkTags
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Transparent Mode Denial of Service Vulnerability CISCO tools.cisco.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 317090 Cisco Adaptive Security Appliance (ASA) Software Denial of Service (DoS) Vulnerability (cisco-sa-asa-ftd-dos-JxYWMJyL)
  • 317097 Cisco Firepower Threat Defense (FTD) Software Transparent Mode Denial of Service (DoS) Vulnerability (cisco-sa-asa-ftd-dos-JxYWMJyL)
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