Vulnerability Name:

CVE-2021-34790 (CCN-212260)

Assigned:2021-10-27
Published:2021-10-27
Updated:2022-10-27
Summary:Multiple vulnerabilities in the Application Level Gateway (ALG) for the Network Address Translation (NAT) feature of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass the ALG and open unauthorized connections with a host located behind the ALG. For more information about these vulnerabilities, see the Details section of this advisory.
Note: These vulnerabilities have been publicly discussed as NAT Slipstreaming.
CVSS v3 Severity:5.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
4.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
4.7 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N)
4.1 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): Low
Availibility (A): None
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
4.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): None
Vulnerability Type:CWE-20
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-34790

Source: XF
Type: UNKNOWN
cisco-cve202134790-sec-bypass(212260)

Source: CCN
Type: Cisco Security Advisory cisco-sa-natalg-bypass-cpKGqkng
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Application Level Gateway Bypass Vulnerabilities

Source: CISCO
Type: Vendor Advisory
20211027 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Application Level Gateway Bypass Vulnerabilities

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.7.0 and < 6.7.0.2)
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version < 6.4.0.12)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.12.0 and < 9.12.4.29)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version < 9.8.4.40)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.13.0 and < 9.14.2.15)
  • OR cpe:/a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:* (Version >= 9.15.0 and < 9.15.1.15)
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.5.0 and < 6.6.5)

    • Configuration 2:
  • cpe:/o:cisco:asa_5512-x_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5512-x_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5512-x:-:*:*:*:*:*:*:*

    • Configuration 3:
  • cpe:/o:cisco:asa_5505_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5505_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5505:-:*:*:*:*:*:*:*

    • Configuration 4:
  • cpe:/o:cisco:asa_5515-x_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5515-x_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5515-x:-:*:*:*:*:*:*:*

    • Configuration 5:
  • cpe:/o:cisco:asa_5525-x_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5525-x_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5525-x:-:*:*:*:*:*:*:*

    • Configuration 6:
  • cpe:/o:cisco:asa_5545-x_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5545-x_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5545-x:-:*:*:*:*:*:*:*

    • Configuration 7:
  • cpe:/o:cisco:asa_5555-x_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5555-x_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5555-x:-:*:*:*:*:*:*:*

    • Configuration 8:
  • cpe:/o:cisco:asa_5580_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5580_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5580:-:*:*:*:*:*:*:*

    • Configuration 9:
  • cpe:/o:cisco:asa_5585-x_firmware:009.015:*:*:*:*:*:*:*
  • OR cpe:/o:cisco:asa_5585-x_firmware:009.008:*:*:*:*:*:*:*
  • AND
  • cpe:/h:cisco:asa_5585-x:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:cisco:adaptive_security_appliance_software:-:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco firepower threat defense *
    cisco firepower threat defense *
    cisco adaptive security appliance *
    cisco adaptive security appliance *
    cisco adaptive security appliance *
    cisco adaptive security appliance *
    cisco firepower threat defense *
    cisco asa 5512-x firmware 009.015
    cisco asa 5512-x firmware 009.008
    cisco asa 5512-x -
    cisco asa 5505 firmware 009.015
    cisco asa 5505 firmware 009.008
    cisco asa 5505 -
    cisco asa 5515-x firmware 009.015
    cisco asa 5515-x firmware 009.008
    cisco asa 5515-x -
    cisco asa 5525-x firmware 009.015
    cisco asa 5525-x firmware 009.008
    cisco asa 5525-x -
    cisco asa 5545-x firmware 009.015
    cisco asa 5545-x firmware 009.008
    cisco asa 5545-x -
    cisco asa 5555-x firmware 009.015
    cisco asa 5555-x firmware 009.008
    cisco asa 5555-x -
    cisco asa 5580 firmware 009.015
    cisco asa 5580 firmware 009.008
    cisco asa 5580 -
    cisco asa 5585-x firmware 009.015
    cisco asa 5585-x firmware 009.008
    cisco asa 5585-x -
    cisco adaptive security appliance software -
    cisco firepower threat defense software *