Vulnerability Name:

CVE-2020-27718 (CCN-193753)

Assigned:2020-12-16
Published:2020-12-16
Updated:2021-07-21
Summary:When a BIG-IP ASM or Advanced WAF system running version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, or 11.6.1-11.6.5.2 processes requests with JSON payload, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
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-400
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-27718

Source: XF
Type: UNKNOWN
f5-cve202027718-dos(193753)

Source: CCN
Type: F5 Security Advisory K58102101
BIG-IP ASM vulnerability CVE-2020-27718

Source: MISC
Type: Vendor Advisory
https://support.f5.com/csp/article/K58102101

Vulnerable Configuration:Configuration 1:
  • cpe:/a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* (Version >= 11.6.1 and <= 11.6.5)
  • OR cpe:/a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* (Version >= 12.1.0 and <= 12.1.5)
  • OR cpe:/a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* (Version >= 13.1.0 and < 13.1.3.5)
  • OR cpe:/a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* (Version >= 14.1.0 and < 14.1.3.1)
  • OR cpe:/a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* (Version >= 15.0.0 and < 15.1.1)
  • OR cpe:/a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* (Version >= 16.0.0 and < 16.0.1)
  • OR cpe:/a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* (Version >= 11.6.1 and <= 11.6.5)
  • OR cpe:/a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* (Version >= 12.1.0 and <= 12.1.5)
  • OR cpe:/a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* (Version >= 13.1.0 and < 13.1.3.5)
  • OR cpe:/a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* (Version >= 14.1.0 and < 14.1.3.1)
  • OR cpe:/a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* (Version >= 15.0.0 and < 15.1.1)
  • OR cpe:/a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:* (Version >= 16.0.0 and < 16.0.1)

    • Configuration CCN 1:
  • cpe:/a:f5:big-ip:14.1.0:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:15.0.0:*:*:*:*:*:*:*
  • OR cpe:/a:f5:big-ip:13.1.0:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:13.1.3:*:*:*:*:*:*:*
  • OR cpe:/a:f5:big-ip:12.1.0:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:12.1.5:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:11.6.5:*:*:*:*:*:*:*
  • OR cpe:/a:f5:big-ip:11.6.1:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:15.1.0:*:*:*:*:*:*:*
  • OR cpe:/a:f5:big-ip:11.6.1:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:11.6.5:*:*:*:*:*:*:*
  • OR cpe:/a:f5:big-ip:12.1.0:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:12.1.5:*:*:*:*:*:*:*
  • OR cpe:/a:f5:big-ip:13.1.0:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:13.1.3:*:*:*:*:*:*:*
  • OR cpe:/a:f5:big-ip:14.1.0:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:15.0.0:*:*:*:*:*:*:*
  • OR cpe:/o:f5:big-ip:15.1.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    f5 big-ip advanced web application firewall *
    f5 big-ip advanced web application firewall *
    f5 big-ip advanced web application firewall *
    f5 big-ip advanced web application firewall *
    f5 big-ip advanced web application firewall *
    f5 big-ip advanced web application firewall *
    f5 big-ip application security manager *
    f5 big-ip application security manager *
    f5 big-ip application security manager *
    f5 big-ip application security manager *
    f5 big-ip application security manager *
    f5 big-ip application security manager *
    f5 big-ip 14.1.0
    f5 big-ip 15.0.0
    f5 big-ip 13.1.0
    f5 big-ip 13.1.3
    f5 big-ip 12.1.0
    f5 big-ip 12.1.5
    f5 big-ip 11.6.5
    f5 big-ip 11.6.1
    f5 big-ip 15.1.0
    f5 big-ip 11.6.1
    f5 big-ip 11.6.5
    f5 big-ip 12.1.0
    f5 big-ip 12.1.5
    f5 big-ip 13.1.0
    f5 big-ip 13.1.3
    f5 big-ip 14.1.0
    f5 big-ip 15.0.0
    f5 big-ip 15.1.0