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JuniperCVELIST:CVE-2021-31362

HistoryOct 13, 2021 - 12:00 a.m.

CVE-2021-31362 Junos OS and Junos OS Evolved: An IS-IS adjacency might be taken down if a bad hello PDU is received for an existing adjacency causing a DoS

2021-10-1300:00:00

CWE-693

juniper

www.cve.org

6.5 Medium

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.001 Low

EPSS

Percentile

26.9%

JSON

A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition. Continued receipted of these spoofed PDUs will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO.

CNA Affected

[
  {
    "product": "Junos OS",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "18.2R3-S8",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "lessThan": "18.3R3-S5",
        "status": "affected",
        "version": "18.3",
        "versionType": "custom"
      },
      {
        "lessThan": "18.4R3-S9",
        "status": "affected",
        "version": "18.4",
        "versionType": "custom"
      },
      {
        "lessThan": "19.1R3-S7",
        "status": "affected",
        "version": "19.1",
        "versionType": "custom"
      },
      {
        "lessThan": "19.2R1-S7, 19.2R3-S3",
        "status": "affected",
        "version": "19.2",
        "versionType": "custom"
      },
      {
        "lessThan": "19.3R2-S6, 19.3R3-S2",
        "status": "affected",
        "version": "19.3",
        "versionType": "custom"
      },
      {
        "lessThan": "19.4R3-S3",
        "status": "affected",
        "version": "19.4",
        "versionType": "custom"
      },
      {
        "lessThan": "20.1R3",
        "status": "affected",
        "version": "20.1",
        "versionType": "custom"
      },
      {
        "lessThan": "20.2R3",
        "status": "affected",
        "version": "20.2",
        "versionType": "custom"
      },
      {
        "lessThan": "20.3R3",
        "status": "affected",
        "version": "20.3",
        "versionType": "custom"
      },
      {
        "lessThan": "20.4R2",
        "status": "affected",
        "version": "20.4",
        "versionType": "custom"
      }
    ]
  },
  {
    "product": "Junos OS Evolved",
    "vendor": "Juniper Networks",
    "versions": [
      {
        "lessThan": "20.4R2-EVO",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      },
      {
        "lessThan": "21.1R2-EVO",
        "status": "affected",
        "version": "21.1",
        "versionType": "custom"
      }
    ]
  }
]

References

kb.juniper.net/JSA11224

6.5 Medium

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.001 Low

EPSS

Percentile

26.9%

JSON

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