Vulnerability Name:

CVE-2021-1402 (CCN-200942)

Assigned:2020-11-13
Published:2021-04-28
Updated:2022-08-05
Summary:A vulnerability in the software-based SSL/TLS message handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL decryption. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message through an affected device. SSL/TLS messages sent to an affected device do not trigger this vulnerability. A successful exploit could allow the attacker to cause a process to crash. This crash would then trigger a reload of the device. No manual intervention is needed to recover the device after the reload.
CVSS v3 Severity:8.6 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/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): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
8.6 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
7.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/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): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:7.8 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-20
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-1402

Source: XF
Type: UNKNOWN
cisco-cve20211402-dos(200942)

Source: CCN
Type: Cisco Security Advisory cisco-sa-ftd-ssl-decrypt-dos-DdyLuK6c
Cisco Firepower Threat Defense Software SSL Decryption Policy Denial of Service Vulnerability

Source: CISCO
Type: Vendor Advisory
20210428 Cisco Firepower Threat Defense Software SSL Decryption Policy Denial of Service Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.5.0 and < 6.6.0)
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.3.0 and < 6.4.0)
  • AND
  • cpe:/h:cisco:asa_5512-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asa_5515-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asa_5525-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asa_5545-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:asa_5555-x:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_2110:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_2120:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_2130:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_2140:-:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_threat_defense_virtual:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_1010:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_1120:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_1140:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:isa_3000:-:*:*:*:*:*:*:*
  • OR cpe:/h:cisco:firepower_1150:-:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco firepower threat defense *
    cisco firepower threat defense *
    cisco asa 5512-x -
    cisco asa 5515-x -
    cisco asa 5525-x -
    cisco asa 5545-x -
    cisco asa 5555-x -
    cisco firepower 2110 -
    cisco firepower 2120 -
    cisco firepower 2130 -
    cisco firepower 2140 -
    cisco firepower threat defense virtual -
    cisco firepower 1010 -
    cisco firepower 1120 -
    cisco firepower 1140 -
    cisco isa 3000 -
    cisco firepower 1150 -
    cisco firepower threat defense software *