CVE-2022-22195Network attack vector

Routing-engine crash via kernel reference-count overflow

Published Apr 14, 2022 · Updated Sep 16, 2024

Improper reference-count updates in the Junos OS Evolved kernel allow remote attackers to crash the routing engine with specific packets. The kernel updates a reference counter incorrectly while processing packets that reach the routing engine, allowing the counter to overflow. No authentication is required; continued processing eventually crashes the routing engine and interrupts network service.

CVSS severity7.5
High
EPSS probability1.06%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper reference-count updates in the Junos OS Evolved kernel allow remote attackers to crash the routing engine with specific packets. The kernel updates a reference counter incorrectly while processing packets that reach the routing engine, allowing the counter to overflow. No authentication is required; continued processing eventually crashes the routing engine and interrupts network service.

The record

CVE
CVE-2022-22195
Published
Apr 14, 2022
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-911, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 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=21.1 <21.1R3-EVO
  2. Affected versionversion=21.2 <21.2R3-EVO
  3. Affected versionversion=21.3 <21.3R2-EVO
  4. Affected versionversion=unspecified <20.4R3-S1-EVO

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=21.1 <21.1R3-EVO; version=21.2 <21.2R3-EVO; version=21.3 <21.3R2-EVO; version=unspecified <20.4R3-S1-EVO

Published CVSS scores

7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
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

CWE-911Improper Update of Reference Count
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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