CVE-2022-22209Network attack vector

Route installation denial via unreleased nexthop memory

Published Jul 20, 2022 · Updated Sep 17, 2024

Memory leak in the kernel of Juniper Networks Junos OS allows remote attackers to block installation of new routes. Interface flaps or route churn leave RTNEXTHOP route and next-hop memory unreleased until the Kernel Routing Table queue reaches ENOMEM and stalls, desynchronizing the RIB and forwarding tables. No authentication is required, and sustained route or interface churn exhausts routing memory rather than crashing the device, preventing subsequent route additions.

CVSS severity7.5
High
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the kernel of Juniper Networks Junos OS allows remote attackers to block installation of new routes. Interface flaps or route churn leave RTNEXTHOP route and next-hop memory unreleased until the Kernel Routing Table queue reaches ENOMEM and stalls, desynchronizing the RIB and forwarding tables. No authentication is required, and sustained route or interface churn exhausts routing memory rather than crashing the device, preventing subsequent route additions.

The record

CVE
CVE-2022-22209
Published
Jul 20, 2022
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=21.2 <21.2R3
  2. Affected versionversion=21.3 <21.3R2-S1, 21.3R3
  3. Affected versionversion=21.4 <21.4R1-S2, 21.4R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=21.2 <21.2R3; version=21.3 <21.3R2-S1, 21.3R3; version=21.4 <21.4R1-S2, 21.4R2

Published CVSS scores

7.5Juniper Networks, Inc.CVSS:3.1/AV:N/AC:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application 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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