CVE-2021-31353

CVSS V2 Medium 5 CVSS V3 High 7.5
Description
An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.
Overview
  • CVE ID
  • CVE-2021-31353
  • Assigner
  • sirt@juniper.net
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-10-19T19:15:08
  • Last Modified Date
  • 2021-10-25T21:41:46
Weakness Enumerations
CWE URL
CWE-755 http://cwe.mitre.org/data/definitions/755.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:o:juniper:junos:19.3:r3-s2:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:19.4:r3-s3:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:20.2:r2-s3:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:20.2:r3:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:20.2:r3-s1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:* 1 OR 20.3
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s2:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s2:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:* 1 OR
cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:* 1 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:L/Au:N/C:N/I:N/A:P
  • Access Vector
  • NETWORK
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • NONE
  • Availability Impact
  • PARTIAL
  • Base Score
  • 5
  • Severity
  • MEDIUM
  • Exploitability Score
  • 10
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • HIGH
  • Base Score
  • 7.5
  • Base Severity
  • HIGH
  • Exploitability Score
  • 3.9
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://kb.juniper.net/JSA11218 Exploit Mitigation Vendor Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-31353
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31353
History
Created Old Value New Value Data Type Notes
2022-05-10 06:49:56 Added to TrackCVE
2022-12-05 12:41:10 2021-10-19T19:15Z 2021-10-19T19:15:08 CVE Published Date updated
2022-12-05 12:41:10 2021-10-25T21:41:46 CVE Modified Date updated
2022-12-05 12:41:10 Analyzed Vulnerability Status updated