Vulnerability Details : CVE-2021-31353
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.
Vulnerability category: Denial of service
Exploit prediction scoring system (EPSS) score for CVE-2021-31353
Probability of exploitation activity in the next 30 days: 0.09%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 36 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-31353
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
Juniper Networks, Inc. |
CWE ids for CVE-2021-31353
-
The product does not handle or incorrectly handles an exceptional condition.Assigned by:
- nvd@nist.gov (Primary)
- sirt@juniper.net (Secondary)
References for CVE-2021-31353
-
https://kb.juniper.net/JSA11218
2021-10 Security Bulletin: Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update (CVE-2021-31353) - Juniper NetworksExploit;Mitigation;Vendor Advisory
Products affected by CVE-2021-31353
- cpe:2.3:o:juniper:junos:20.2:r2-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.2:r3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.2:r3-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r3-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r3-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:20.4:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:20.4:r1-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:20.4:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:20.4:r2-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:*