Vulnerability in Juniper Junos
CVE-2021-31362
A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition. Continued receipted of these spoofed PDUs will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO.
EPSS: 0.004 (33.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Juniper Junos — versions 18.2, 18.3, 18.4
- Juniper Junos_os_evolved — versions 20.4, 21.1
- Juniper Networks Junos Os — versions unspecified, 18.3, 18.4
- Juniper Networks Junos Os Evolved — versions unspecified, 21.1
Weakness classification (CWE)
References
- sirt@juniper.net (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-31362?
- CVE-2021-31362 is a medium-severity vulnerability in Juniper Junos, classified under Protection Mechanism Failure. CVSS score: 6.5/10. Published 2021-10-19.
- How severe is CVE-2021-31362?
- Medium severity. CVSS v3 base score is 6.5 out of 10.