CVE-2023-22402

Junos OS Evolved: The kernel might restart in a BGP scenario where "bgp auto-discovery" is enabled and such a neighbor flaps

MEDIUM

5.9

CVSS Score

Published: January 12, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 05:35 AM UTC

2 products affected across 2 vendorsJunos OS EvolvedJunos OS Evolved

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Severity

MEDIUM5.9

Exploit prediction

EPSS 0.5%

SSVC

No known exploit

Description

A Use After Free vulnerability in the kernel of Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). In a Non Stop Routing (NSR) scenario, an unexpected kernel restart might be observed if "bgp auto-discovery" is enabled and if there is a BGP neighbor flap of auto-discovery sessions for any reason. This is a race condition which is outside of an attackers direct control and it depends on system internal timing whether this issue occurs. This issue affects Juniper Networks Junos OS Evolved: 21.3 versions prior to 21.3R3-EVO; 21.4 versions prior to 21.4R2-EVO; 22.1 versions prior to 22.1R2-EVO; 22.2 versions prior to 22.2R1-S1-EVO, 22.2R2-EVO.

Affected

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

Junos OS Evolved · Juniper

95%

21.3 21.3 r1 21.3 r1-s1 21.3 r2 21.3 r2-s1 21.3 r2-s2 21.4 21.4 r1 21.4 r1-s1 21.4 r1-s2 22.1 r1 22.1 r1-s1 22.1 r1-s2 22.2 r1

Junos OS Evolved · Juniper Networks

60%

21.3 ≤ v < 21.3R3-EVO21.4 ≤ v < 21.4R2-EVO22.1 ≤ v < 22.1R2-EVO22.2 ≤ v < 22.2R1-S1-EVO, 22.2R2-EVO21.3 21.4 22.1 22.2

Affected range stops below 21.3R3-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 21.4R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.1R2-EVO, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2R1-S1-EVO, 22.2R2-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/JSA70198

References (1)

Vendor Advisory

Source: [email protected]

https://kb.juniper.net/JSA70198

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-416

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