CVE-2022-22171Network attack vector

PFE reset via exceptional VXLAN packets

Published Jan 19, 2022 · Updated Sep 16, 2024

Improper exception handling in the Juniper Junos OS Packet Forwarding Engine allows remote attackers to reset it with VXLAN packets. Juniper has not disclosed the exceptional packet condition or failed check; affected PFEs reset instead of rejecting the packets. An affected release must use the documented virtual-switch and VXLAN bridge-domain configuration; crafted traffic then interrupts packet forwarding during the reset.

CVSS severity7.5
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exception handling in the Juniper Junos OS Packet Forwarding Engine allows remote attackers to reset it with VXLAN packets. Juniper has not disclosed the exceptional packet condition or failed check; affected PFEs reset instead of rejecting the packets. An affected release must use the documented virtual-switch and VXLAN bridge-domain configuration; crafted traffic then interrupts packet forwarding during the reset.

The record

CVE
CVE-2022-22171
Published
Jan 19, 2022
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-754, T1498
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=19.4 <19.4R3-S7
  2. Affected versionversion=20.1 <20.1R3-S3
  3. Affected versionversion=20.2 <20.2R3-S3
  4. Affected versionversion=20.3 <20.3R3-S2
  5. Affected versionversion=20.4 <20.4R3-S1
  6. Affected versionversion=21.1 <21.1R3
  7. Affected versionversion=21.2 <21.2R2
  8. Affected versionversion=21.3 <21.3R1-S1, 21.3R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=19.4 <19.4R3-S7; version=20.1 <20.1R3-S3; version=20.2 <20.2R3-S3; version=20.3 <20.3R3-S2; version=20.4 <20.4R3-S1; version=21.1 <21.1R3; version=21.2 <21.2R2; version=21.3 <21.3R1-S1, 21.3R2

Published CVSS scores

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 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-754Improper Check for Unusual or Exceptional Conditions
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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