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

CVE-2021-31353

CVE-2021-31353

Description

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.

Affected products

25
  • Juniper Networks/Junosllm-fuzzy12 versions
    19.3R3-S2, 19.4R3-S3, 20.2R2-S3 - 20.2R3-S1, 20.3R2 - 20.3R2, 20.4R2 - 20.4R2, 21.1R1+ 11 more
    • (no CPE)range: 19.3R3-S2, 19.4R3-S3, 20.2R2-S3 - 20.2R3-S1, 20.3R2 - 20.3R2, 20.4R2 - 20.4R2, 21.1R1
    • cpe:2.3:o:juniper:junos:19.3:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2-s3:*:*:*:*:*:*
    • 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:20.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r1-s1:*:*:*:*:*:*
  • Juniper Networks/OS Evolvedv513 versions
    unspecified+ 12 more
    • (no CPE)range: unspecified
    • (no CPE)range: 20.4R2-S3-EVO, 20.4R3-EVO, 21.1R1-EVO, 21.2R1
    • cpe:2.3:o:juniper:junos_os_evolved:*:*:*:*:*:*:*:*range: <=20.3
    • 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: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:21.1:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:21.2:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos_os_evolved:21.2:r1-s1:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

1

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