Home/CVE/An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Ne
CVE

CVE-2021-31351

An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Ne

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;.

HIGH · CVSS 7.5 EPSS 0.00389
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-754Improper Check for Unusual or Exceptional Conditions
▤

Affected Products & Versions

1
juniper junosall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · sirt@juniper.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 Oct 2021 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kb.juniper.net/JSA11216Vendor Advisory
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