Vulnerability Name:

CVE-2020-1646 (CCN-184779)

Assigned:2019-11-04
Published:2020-07-08
Updated:2022-01-01
Summary:On Juniper Networks Junos OS and Junos OS Evolved devices, processing a specific UPDATE for an EBGP peer can lead to a routing process daemon (RPD) crash and restart. This issue occurs only when the device is receiving and processing the BGP UPDATE for an EBGP peer. This issue does not occur when the device is receiving and processing the BGP UPDATE for an IBGP peer. However, the offending BGP UPDATE can originally come from an EBGP peer, propagates through the network via IBGP peers without causing crash, then it causes RPD crash when it is processed for a BGP UPDATE towards an EBGP peer. Repeated receipt and processing of the same specific BGP UPDATE can result in an extended Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS: 17.3R3-S6, 17.4R2-S7, and 18.1R3-S7. Juniper Networks Junos OS Evolved 19.2R2-EVO and later versions, prior to 19.3R1-EVO. Other Junos OS releases are not affected.
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:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
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-noinfo
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-1646

Source: XF
Type: UNKNOWN
juniper-cve20201646-dos(184779)

Source: CCN
Type: Juniper Networks Security Bulletin JSA11033
Junos OS and Junos OS Evolved: RPD crash while processing a specific BGP update information. (CVE-2020-1646)

Source: CONFIRM
Type: Vendor Advisory
https://kb.juniper.net/JSA11033

Vulnerable Configuration:Configuration 1:
  • cpe:/o:juniper:junos:17.3:r3-s6:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:r2-s7:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:18.1:r3-s7:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos_os_evolved:19.2:r2:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:juniper:junos:17.3:-:*:*:*:*:*:*
  • OR cpe:/a:juniper:junos:18.1:-:*:*:*:*:*:*
  • OR cpe:/o:juniper:junos:17.4:-:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    juniper junos 17.3 r3-s6
    juniper junos 17.4 r2-s7
    juniper junos 18.1 r3-s7
    juniper junos os evolved 19.2 r2
    juniper junos 17.3 -
    juniper junos 18.1 -
    juniper junos 17.4 -