CVE-2022-22225

Junos OS and Junos OS Evolved: In a BGP multipath scenario, when one of the contributing routes is flapping often and rapidly, rpd may crash

MEDIUM

5.9

CVSS Score

Published: October 18, 2022 at 02:46 AM UTC

Updated: June 17, 2026 at 04:28 AM UTC

3 products affected across 2 vendorsJunosJunos OS EvolvedJunos OS Evolved

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Severity

MEDIUM5.9

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

A Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated attacker with an established BGP session to cause a Denial of Service (DoS). In a BGP multipath scenario, when one of the contributing routes is flapping often and rapidly, rpd may crash. As this crash depends on whether a route is a contributing route, and on the internal timing of the events triggered by the flap this vulnerability is outside the direct control of a potential attacker. This issue affects: Juniper Networks Junos OS 19.2 versions prior to 19.2R3-S6; 20.2 versions prior to 20.2R3-S4; 20.3 versions prior to 20.3R3-S3; 20.4 versions prior to 20.4R3-S4; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2; 21.3 versions prior to 21.3R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-S4-EVO; 21.1-EVO version 21.1R1-EVO and later versions; 21.2-EVO versions prior to 21.2R2-EVO; 21.3-EVO versions prior to 21.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions 19.2 versions prior to 19.2R2, 19.3R1 and above prior to 20.2R1. Juniper Networks Junos OS Evolved versions prior to 20.2R1-EVO.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos OS Evolved · Juniper

95%

Affected range stops below 20.4, so it looks safe — our inference, not a vendor statement

Junos · Juniper Networks

95%

20.2 ≤ v < 20.2R3-S420.3 ≤ v < 20.3R3-S320.4 ≤ v < 20.4R3-S421.1 ≤ v < 21.1R321.2 ≤ v < 21.2R221.3 ≤ v < 21.3R219.2 19.2 r1 19.2 r1-s1 19.2 r1-s2 19.2 r1-s3 19.2 r1-s4 19.2 r1-s5 19.2 r1-s6 19.2 r1-s7 19.2 r1-s8 19.2 r1-s9 19.2 r2 19.2 r2-s1 19.2 r3 19.2 r3-s1 19.2 r3-s2 19.2 r3-s3 19.2 r3-s4 19.2 r3-s5 20.2 20.2 r1 20.2 r1-s1 20.2 r1-s2 20.2 r1-s3 20.2 r2 20.2 r2-s1 20.2 r2-s2 20.2 r2-s3 20.2 r3 20.2 r3-s1 20.2 r3-s2 20.2 r3-s3 20.3 20.3 r1 20.3 r1-s1 20.3 r1-s2 20.3 r2 20.3 r2-s1 20.3 r3 20.3 r3-s1 20.3 r3-s2 20.4 20.4 r1 20.4 r1-s1 20.4 r2 20.4 r2-s1 20.4 r2-s2 20.4 r3 20.4 r3-s1 20.4 r3-s2 20.4 r3-s3 21.1 21.1 r1 21.1 r1-s1 21.1 r2 21.1 r2-s1 21.1 r2-s2 21.2 21.2 r1 21.2 r1-s1 21.2 r1-s2 21.3 21.3 r1 21.3 r1-s1 21.3 r1-s2

Vendor states this is fixed in 19.2 (unaffected)

Vendor states this is fixed in 19.3R1 (unaffected)

Vendor states this is fixed in 19.4R1 (unaffected)

Vendor states this is fixed in 20.1R1 (unaffected)

Affected range stops below 20.2R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.3R3-S3, so it looks safe — our inference, not a vendor statement

Affected range stops below 20.4R3-S4, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1R3, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R2, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R2, so it looks safe — our inference, not a vendor statement

Junos OS Evolved · Juniper Networks

60%

v < 20.4R3-S4-EVO21.1R1-EVO ≤ v < 21.1-EVO*21.2-EVO ≤ v < 21.2R2-EVO21.3-EVO ≤ v < 21.3R2-EVO21.1R1-EVO 21.2-EVO 21.3-EVO

Vendor states this is fixed in 20.2R1-EVO (unaffected)

Affected range stops below 20.4R3-S4-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.1-EVO*, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.2R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.3R2-EVO, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://kb.juniper.net/JSA69875

References (1)

Vendor Advisory

Source: [email protected]

https://kb.juniper.net/JSA69875

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.9MEDIUMjuniper

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-367

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