CVE-2021-34793

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-34793
A 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.

8.6 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

5.0 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References
Link Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

Configuration 2 (hide)

AND
cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5512-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*

Configuration 3 (hide)

AND
cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5505_firmware:009.008\(004.025\):*:*:*:*:*:*:*

Configuration 4 (hide)

AND
cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5515-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*

Configuration 5 (hide)

AND
cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5525-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*

Configuration 6 (hide)

AND
cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5545-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*

Configuration 7 (hide)

AND
cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5555-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*

Configuration 8 (hide)

AND
cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5580_firmware:009.008\(004.025\):*:*:*:*:*:*:*

Configuration 9 (hide)

AND
cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5585-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*
History

16 Aug 2023, 16:17

Type Values Removed Values Added
CPE cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*

29 Oct 2021, 02:12

Type Values Removed Values Added
References (CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL - (CISCO) https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL - Vendor Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : 5.0
v3 : 8.6
CWE CWE-924
CPE cpe:2.3:o:cisco:asa_5545-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*
cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5555-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5585-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5525-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5512-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5515-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5505_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:asa_5580_firmware:009.008\(004.025\):*:*:*:*:*:*:*
cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*

27 Oct 2021, 20:15

Type Values Removed Values Added
Summary A 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. A 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.

27 Oct 2021, 19:35

Type Values Removed Values Added
New CVE
Information

Published : 2021-10-27 19:15

Updated : 2024-02-04 22:08

NVD link : CVE-2021-34793

Mitre link : CVE-2021-34793

CVE.ORG link : CVE-2021-34793

JSON object : View

Products Affected

cisco

  • adaptive_security_appliance
  • asa_5580_firmware
  • asa_5505
  • asa_5545-x_firmware
  • asa_5555-x_firmware
  • asa_5525-x
  • asa_5505_firmware
  • asa_5555-x
  • asa_5580
  • asa_5585-x_firmware
  • asa_5585-x
  • asa_5515-x_firmware
  • asa_5525-x_firmware
  • asa_5512-x_firmware
  • asa_5545-x
  • adaptive_security_appliance_software
  • asa_5512-x
  • asa_5515-x
  • firepower_threat_defense
CWE
CWE-924

Improper Enforcement of Message Integrity During Transmission in a Communication Channel