Vulnerability · Published Oct 19, 2021 · Assigned by juniper
CVE-2021-31363Junos OS and Junos OS Evolved: Receipt of a specific LDP message will cause a Denial of Service
Medium 6.5
In plain English
A medium-severity infinite loop in Junos OS from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS | 19.2R2 – before 19.2*19.3 – before 19.3R2-S6, 19.3R3-S219.4 – before 19.4R1-S4, 19.4R2-S4, 19.4R3-S220.1 – before 20.1R2-S1, 20.1R320.2 – before 20.2R2-S1, 20.2R320.3 – before 20.3R1-S2, 20.3R2 |
| Juniper Networks | Junos OS Evolved | unspecified – before 20.1R2-S3-EVO20.3 – before 20.3R1-S2-EVO |
Weakness: CWE-835 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://kb.juniper.net/JSA11225 x_refsource_CONFIRM