Vulnerability Name:

CVE-2021-0226 (CCN-199939)

Assigned:2020-10-27
Published:2021-04-14
Updated:2021-10-07
Summary:On Juniper Networks Junos OS Evolved devices, receipt of a specific IPv6 packet may cause an established IPv6 BGP session to terminate, creating a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue does not affect IPv4 BGP sessions. This issue affects IBGP or EBGP peer sessions with IPv6. This issue affects: Juniper Networks Junos OS Evolved: 19.4 versions prior to 19.4R2-S3-EVO; 20.1 versions prior to 20.1R2-S3-EVO; 20.2 versions prior to 20.2R2-S1-EVO; 20.3 versions prior to 20.3R2-EVO. This issue does not affect Juniper Networks Junos OS releases.
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
7.1 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)
6.2 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Adjacent
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): 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
6.8 Medium (CCN CVSS v2 Vector: AV:A/AC:L/Au:N/C:N/I:P/A:C)
Exploitability Metrics:Access Vector (AV): Adjacent_Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Partial
Availibility (A): Complete
Vulnerability Type:CWE-665
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2021-0226

Source: XF
Type: UNKNOWN
juniper-cve20210226-dos(199939)

Source: CCN
Type: Juniper Networks Security Bulletin JSA11121
Junos OS Evolved: The IPv6 BGP session will flap due to receipt of a specific IPv6 packet

Source: MISC
Type: Vendor Advisory
https://kb.juniper.net/JSA11121

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos_os_evolved:20.1:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:r2-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.1:r2-s2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.2:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.2:r1-s1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.2:r2:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.3:r1:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:20.3:r1-s1:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    juniper junos os evolved 20.1 r1
    juniper junos os evolved 20.1 r1-s1
    juniper junos os evolved 20.1 r2
    juniper junos os evolved 20.1 r2-s1
    juniper junos os evolved 20.1 r2-s2
    juniper junos os evolved 20.2 r1
    juniper junos os evolved 20.2 r1-s1
    juniper junos os evolved 20.2 r2
    juniper junos os evolved 20.3 r1
    juniper junos os evolved 20.3 r1-s1