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Vulnerability Details : CVE-2021-31363

In an MPLS P2MP environment a Loop with Unreachable Exit Condition vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause high load on RPD which in turn may lead to routing protocol flaps. If a system with sensor-based-stats enabled receives a specific LDP FEC this can lead to the above condition. Continued receipted of such an LDP FEC will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 version 19.2R2 and later versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.1R2-S3-EVO; 20.3 versions prior to 20.3R1-S2-EVO.
Publish Date : 2021-10-19 Last Update Date : 2021-10-25
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- CVSS Scores & Vulnerability Types

CVSS Score
3.3
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 835

- Products Affected By CVE-2021-31363

# Product Type Vendor Product Version Update Edition Language
1 OS Juniper Junos 19.2 R2 * * Version Details Vulnerabilities
2 OS Juniper Junos 19.2 R2-s1 * * Version Details Vulnerabilities
3 OS Juniper Junos 19.2 R3 * * Version Details Vulnerabilities
4 OS Juniper Junos 19.2 R3-s1 * * Version Details Vulnerabilities
5 OS Juniper Junos 19.2 R3-s2 * * Version Details Vulnerabilities
6 OS Juniper Junos 19.3 R2-s2 * * Version Details Vulnerabilities
7 OS Juniper Junos 19.3 - * * Version Details Vulnerabilities
8 OS Juniper Junos 19.3 R2-s3 * * Version Details Vulnerabilities
9 OS Juniper Junos 19.3 R1 * * Version Details Vulnerabilities
10 OS Juniper Junos 19.3 R2-s4 * * Version Details Vulnerabilities
11 OS Juniper Junos 19.3 R1-s1 * * Version Details Vulnerabilities
12 OS Juniper Junos 19.3 R2-s5 * * Version Details Vulnerabilities
13 OS Juniper Junos 19.3 R2 * * Version Details Vulnerabilities
14 OS Juniper Junos 19.3 R3-s2 * * Version Details Vulnerabilities
15 OS Juniper Junos 19.3 R2-s1 * * Version Details Vulnerabilities
16 OS Juniper Junos 19.4 R1 * * Version Details Vulnerabilities
17 OS Juniper Junos 19.4 R1-s1 * * Version Details Vulnerabilities
18 OS Juniper Junos 19.4 R1-s2 * * Version Details Vulnerabilities
19 OS Juniper Junos 19.4 R1-s3 * * Version Details Vulnerabilities
20 OS Juniper Junos 19.4 R2-s4 * * Version Details Vulnerabilities
21 OS Juniper Junos 19.4 R3-s2 * * Version Details Vulnerabilities
22 OS Juniper Junos 20.1 R2 * * Version Details Vulnerabilities
23 OS Juniper Junos 20.1 R1 * * Version Details Vulnerabilities
24 OS Juniper Junos 20.1 R3 * * Version Details Vulnerabilities
25 OS Juniper Junos 20.1 R1-s1 * * Version Details Vulnerabilities
26 OS Juniper Junos 20.1 R1-s2 * * Version Details Vulnerabilities
27 OS Juniper Junos 20.1 R1-s3 * * Version Details Vulnerabilities
28 OS Juniper Junos 20.1 R1-s4 * * Version Details Vulnerabilities
29 OS Juniper Junos 20.2 R2 * * Version Details Vulnerabilities
30 OS Juniper Junos 20.2 R3 * * Version Details Vulnerabilities
31 OS Juniper Junos 20.2 R1 * * Version Details Vulnerabilities
32 OS Juniper Junos 20.2 R1-s1 * * Version Details Vulnerabilities
33 OS Juniper Junos 20.2 R1-s2 * * Version Details Vulnerabilities
34 OS Juniper Junos 20.2 R1-s3 * * Version Details Vulnerabilities
35 OS Juniper Junos 20.3 R1 * * Version Details Vulnerabilities
36 OS Juniper Junos 20.3 R1-s1 * * Version Details Vulnerabilities
37 OS Juniper Junos 20.3 R2 * * Version Details Vulnerabilities
38 OS Juniper Junos Os Evolved 20.1 R1 * * Version Details Vulnerabilities
39 OS Juniper Junos Os Evolved 20.1 R1-s1 * * Version Details Vulnerabilities
40 OS Juniper Junos Os Evolved 20.1 R2 * * Version Details Vulnerabilities
41 OS Juniper Junos Os Evolved 20.1 R2-s1 * * Version Details Vulnerabilities
42 OS Juniper Junos Os Evolved 20.1 R2-s2 * * Version Details Vulnerabilities
43 OS Juniper Junos Os Evolved 20.2 R1 * * Version Details Vulnerabilities
44 OS Juniper Junos Os Evolved 20.2 R1-s1 * * Version Details Vulnerabilities
45 OS Juniper Junos Os Evolved 20.2 R2 * * Version Details Vulnerabilities
46 OS Juniper Junos Os Evolved 20.3 R1 * * Version Details Vulnerabilities
47 OS Juniper Junos Os Evolved 20.3 R1-s1 * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Juniper Junos 37
Juniper Junos Os Evolved 10

- References For CVE-2021-31363

https://kb.juniper.net/JSA11225 CONFIRM

- Metasploit Modules Related To CVE-2021-31363

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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