Vulnerability Database

296,202

Total vulnerabilities in the database

CVE-2021-31351

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;

  • Published: Oct 19, 2021
  • Updated: May 4, 2025
  • CVE: CVE-2021-31351
  • Severity: Medium
  • Exploit:

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P

CWEs:

Software From Fixed in
juniper / junos 17.3-r3-s11 17.3-r3-s11.x
juniper / junos 17.4-r3-s4 17.4-r3-s4.x
juniper / junos 17.4-r3 17.4-r3.x
juniper / junos 17.4-r3-s1 17.4-r3-s1.x
juniper / junos 17.4-r3-s2 17.4-r3-s2.x
juniper / junos 17.4-r3-s3 17.4-r3-s3.x
juniper / junos 17.4-r2-s13 17.4-r2-s13.x
juniper / junos 18.1-r3-s12 18.1-r3-s12.x
juniper / junos 18.2-r3-s7 18.2-r3-s7.x
juniper / junos 18.2-r2-s8 18.2-r2-s8.x
juniper / junos 18.2-r3-s8 18.2-r3-s8.x
juniper / junos 18.3-r3-s4 18.3-r3-s4.x
juniper / junos 18.4-r3-s7 18.4-r3-s7.x
juniper / junos 19.1-r3-s4 19.1-r3-s4.x
juniper / junos 19.1-r3-s5 19.1-r3-s5.x
juniper / junos 19.2-r1-s6 19.2-r1-s6.x
juniper / junos 19.3-r3-s2 19.3-r3-s2.x
juniper / junos 19.4-r3-s2 19.4-r3-s2.x
juniper / junos 19.4-r2-s4 19.4-r2-s4.x
juniper / junos 19.4-r2-s5 19.4-r2-s5.x
juniper / junos 20.1-r2-s1 20.1-r2-s1.x
juniper / junos 20.2-r2-s3 20.2-r2-s3.x
juniper / junos 20.2-r2-s2 20.2-r2-s2.x
juniper / junos 20.2-r3 20.2-r3.x
juniper / junos 20.3-r2-s1 20.3-r2-s1.x
juniper / junos 20.3-r2 20.3-r2.x
juniper / junos 20.4-r1-s1 20.4-r1-s1.x
juniper / junos 20.4-r1 20.4-r1.x
juniper / junos 20.4-r2 20.4-r2.x
juniper / junos 21.1-r1 21.1-r1.x