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High severity7.5NVD Advisory· Published Oct 19, 2021· Updated Jun 17, 2026

CVE-2021-31383

CVE-2021-31383

Description

In Point to MultiPoint (P2MP) scenarios within established sessions between network or adjacent neighbors the improper use of a source to destination copy write operation combined with a Stack-based Buffer Overflow on certain specific packets processed by the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved sent by a remote unauthenticated network attacker causes the RPD to crash causing a Denial of Service (DoS). Continued receipt and processing of these packets will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R1. Juniper Networks Junos OS Evolved 20.1 versions prior to 20.1R3-EVO; 20.2 versions prior to 20.2R3-EVO; 20.3 versions prior to 20.3R2-EVO.

Affected products

72
  • Juniper Networks/Junos51 versions
    cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*+ 50 more
    • cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.3:r1:*:*:*:*:*:*
    • (no CPE)range: 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R1.
  • Juniper Networks/OS Evolved21 versions
    cpe:2.3:o:juniper:junos_os_evolved:20.1:-:*:*:*:*:*:*+ 20 more
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r2-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r2-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.1:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.2:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.2:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.2:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.2:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.3:-:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.3:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.3:r1-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.3:r1-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:20.3:r1:*:*:*:*:*:*
    • (no CPE)range: 20.1 versions prior to 20.1R3-EVO; 20.2 versions prior to 20.2R3-EVO; 20.3 versions prior to 20.3R2-EVO.
    • (no CPE)range: 20.1

Patches

Vulnerability mechanics

References

1

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