CVE-2022-22220Network attack vector

Unauthenticated rpd crash via BGP route race

Published Oct 18, 2022 · Updated May 12, 2025

TOCTOU race in rpd in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to crash rpd with a BGP flow route. rpd processes a redirect-IP extended community while the redirect next hop's reachability is flapping, allowing state to change between its check and use. Exploitation requires matching two internally timed events outside attacker control; route reflectors are exposed unless firewall installation is disabled.

CVSS severity5.9
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU race in rpd in Juniper Networks Junos OS and Junos OS Evolved allows remote attackers to crash rpd with a BGP flow route. rpd processes a redirect-IP extended community while the redirect next hop's reachability is flapping, allowing state to change between its check and use. Exploitation requires matching two internally timed events outside attacker control; route reflectors are exposed unless firewall installation is disabled.

The record

CVE
CVE-2022-22220
Published
Oct 18, 2022
Updated
May 12, 2025
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-367, CAPEC-29, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2022CVE publishedPublication date reported by the CVE source.
  2. May 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=21.1-EVO <21.1R2-EVO
  2. Affected versionversion=unspecified <20.4R2-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.1-EVO <21.1R2-EVO; version=unspecified <20.4R2-EVO
Juniper Networks · Junos OSversion=18.4 <18.4R2-S10, 18.4R3-S10; version=19.1 <19.1R3-S7; version=19.2 <19.2R1-S8, 19.2R3-S4; version=19.4 <19.4R3-S8; version=20.2 <20.2R3-S3; version=20.3 <20.3R3-S2; version=20.4 <20.4R3; version=21.1 <21.1R2

Published CVSS scores

5.9Juniper Networks, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC-29Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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