Vulnerability Name:

CVE-2021-1566 (CCN-203820)

Assigned:2020-11-13
Published:2021-06-16
Updated:2021-06-23
Summary:A vulnerability in the Cisco Advanced Malware Protection (AMP) for Endpoints integration of Cisco AsyncOS for Cisco Email Security Appliance (ESA) and Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to intercept traffic between an affected device and the AMP servers. This vulnerability is due to improper certificate validation when an affected device establishes TLS connections. A man-in-the-middle attacker could exploit this vulnerability by sending a crafted TLS packet to an affected device. A successful exploit could allow the attacker to spoof a trusted host and then extract sensitive information or alter certain API requests.
CVSS v3 Severity:7.4 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
6.4 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
7.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
6.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:5.8 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): None
7.1 High (CCN CVSS v2 Vector: AV:N/AC:H/Au:N/C:C/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-295
Vulnerability Consequences:Gain Access
References:Source: MITRE
Type: CNA
CVE-2021-1566

Source: XF
Type: UNKNOWN
cisco-cve20211566-mitm(203820)

Source: CCN
Type: Cisco Security Advisory cisco-sa-esa-wsa-cert-vali-n8L97RW
Cisco Email Security Appliance and Cisco Web Security Appliance Certificate Validation Vulnerability

Source: CISCO
Type: Vendor Advisory
20210616 Cisco Email Security Appliance and Cisco Web Security Appliance Certificate Validation Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:email_security_appliance:-:*:*:*:*:*:*:*
  • AND cpe:/o:cisco:asyncos:*:*:*:*:*:*:*:* (Version < 12.5.3-035)

    • Configuration 2:
  • cpe:/a:cisco:email_security_appliance:-:*:*:*:*:*:*:*
  • AND cpe:/o:cisco:asyncos:*:*:*:*:*:*:*:* (Version >= 13.0 and < 13.0.0-030)

    • Configuration 3:
  • cpe:/a:cisco:email_security_appliance:-:*:*:*:*:*:*:*
  • AND cpe:/o:cisco:asyncos:*:*:*:*:*:*:*:* (Version >= 13.5 and < 13.5.3-010)

    • Configuration 4:
  • cpe:/a:cisco:web_security_appliance:-:*:*:*:*:*:*:*
  • AND cpe:/o:cisco:asyncos:*:*:*:*:*:*:*:* (Version < 11.8.3-021)

    • Configuration 5:
  • cpe:/a:cisco:web_security_appliance:-:*:*:*:*:*:*:*
  • AND cpe:/o:cisco:asyncos:*:*:*:*:*:*:*:* (Version >= 12.0.0 and < 12.0.3-005)

    • Configuration 6:
  • cpe:/a:cisco:web_security_appliance:-:*:*:*:*:*:*:*
  • AND cpe:/o:cisco:asyncos:*:*:*:*:*:*:*:* (Version >= 12.5.0 and < 12.5.1-043)

    • Configuration CCN 1:
  • cpe:/a:cisco:web_security_appliance_(wsa):5.6.0-623:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco email security appliance -
    cisco asyncos *
    cisco email security appliance -
    cisco asyncos *
    cisco email security appliance -
    cisco asyncos *
    cisco web security appliance -
    cisco asyncos *
    cisco web security appliance -
    cisco asyncos *
    cisco web security appliance -
    cisco asyncos *
    cisco web security appliance (wsa) 5.6.0-623