CVE-2022-22159Network attack vector

Sustained denial of service via NETISR packet processing

Published Jan 19, 2022 · Updated Sep 16, 2024

Denial of service in the NETISR network queue of Juniper Networks Junos OS allows remote attackers to interrupt routing with crafted packets. The kernel repeatedly processes genuine packets traversing an IPv4 unicast ECMP unilist path, driving the routing protocol daemon CPU to 100% and sustaining the interruption. The packets must traverse an affected ECMP path; forwarding-plane CPUs continue operating normally, so the reported consequence is control-plane service degradation rather than a total forwarding halt.

CVSS severity7.5
High
EPSS probability1.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the NETISR network queue of Juniper Networks Junos OS allows remote attackers to interrupt routing with crafted packets. The kernel repeatedly processes genuine packets traversing an IPv4 unicast ECMP unilist path, driving the routing protocol daemon CPU to 100% and sustaining the interruption. The packets must traverse an affected ECMP path; forwarding-plane CPUs continue operating normally, so the reported consequence is control-plane service degradation rather than a total forwarding halt.

The record

CVE
CVE-2022-22159
Published
Jan 19, 2022
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
T1499.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=17.3R3-S9 <17.3* changes=[{"at":"17.3R3-S12","status":"unaffected"}]
  2. Affected versionversion=17.4R3-S3 <17.4* changes=[{"at":"17.4R3-S5","status":"unaffected"}]
  3. Affected versionversion=18.1R3-S11 <18.1* changes=[{"at":"18.1R3-S13","status":"unaffected"}]
  4. Affected versionversion=18.2R3-S6 <18.2*
  5. Affected versionversion=18.3R3-S4 <18.3* changes=[{"at":"18.3R3-S5","status":"unaffected"}]
  6. Affected versionversion=18.4R3-S5 <18.4* changes=[{"at":"18.4R3-S9","status":"unaffected"}]
  7. Affected versionversion=19.1R3-S3 <19.1* changes=[{"at":"19.1R3-S7","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=17.3R3-S9 <17.3* changes=[{"at":"17.3R3-S12","status":"unaffected"}]; version=17.4R3-S3 <17.4* changes=[{"at":"17.4R3-S5","status":"unaffected"}]; version=18.1R3-S11 <18.1* changes=[{"at":"18.1R3-S13","status":"unaffected"}]; version=18.2R3-S6 <18.2*; version=18.3R3-S4 <18.3* changes=[{"at":"18.3R3-S5","status":"unaffected"}]; version=18.4R3-S5 <18.4* changes=[{"at":"18.4R3-S9","status":"unaffected"}]; version=19.1R3-S3 <19.1* changes=[{"at":"19.1R3-S7","status":"unaffected"}]

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5Juniper NetworksCVSS: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 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

T1499.001OS Exhaustion Flood

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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