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

CVE-2021-31351

CVE-2021-31351

Description

An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Networks Junos OS allows a malicious attacker to send a specific packet, triggering the MS-MPC/MS-MIC to reset, causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects specific versions of Juniper Networks Junos OS on MX Series: 17.3R3-S11; 17.4R2-S13; 17.4R3 prior to 17.4R3-S5; 18.1R3-S12; 18.2R2-S8, 18.2R3-S7, 18.2R3-S8; 18.3R3-S4; 18.4R3-S7; 19.1R3-S4, 19.1R3-S5; 19.2R1-S6; 19.3R3-S2; 19.4R2-S4, 19.4R2-S5; 19.4R3-S2; 20.1R2-S1; 20.2R2-S2, 20.2R2-S3, 20.2R3; 20.3R2, 20.3R2-S1; 20.4R1, 20.4R1-S1, 20.4R2; 21.1R1; This issue does not affect any version of Juniper Networks Junos OS prior to 15.1X49-D240;

Affected products

32
  • Juniper Networks/Junos32 versions
    cpe:2.3:o:juniper:junos:17.3:r3-s11:*:*:*:*:*:*+ 31 more
    • cpe:2.3:o:juniper:junos:17.3:r3-s11:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r2-s13:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3-s3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:17.4:r3:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.1:r3-s12:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2:r2-s8:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2:r3-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.2:r3-s8:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.3:r3-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:18.4:r3-s7:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r3-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.1:r3-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.2:r1-s6:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.3:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2-s4:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r2-s5:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:19.4:r3-s2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.1:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.2:r2-s2:*:*:*:*:*:*
    • 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:20.3:r2-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.3:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r1-s1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r1:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:20.4:r2:*:*:*:*:*:*
    • cpe:2.3:o:juniper:junos:21.1:r1:*:*:*:*:*:*
    • (no CPE)range: 17.3R3-S11, 17.4R2-S13, 17.4R3 prior to 17.4R3-S5, 18.1R3-S12, 18.2R2-S8, 18.2R3-S7, 18.2R3-S8, 18.3R3-S4, 18.4R3-S7, 19.1R3-S4, 19.1R3-S5, 19.2R1-S6, 19.3R3-S2, 19.4R2-S4, 19.4R2-S5, 19.4R3-S2, 20.1R2-S1, 20.2R2-S2, 20.2R2-S3, 20.2R3, 20.3R2, 20.3R2-S1, 20.4R1, 20.4R1-S1, 20.4R2, 21.1R1
    • (no CPE)range: 17.3R3-S11

Patches

Vulnerability mechanics

References

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News mentions

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