CVE-2022-22201Network attack vector

PFE crash via malformed ESP packet

Published Oct 18, 2022 · Updated May 12, 2025

Improper index validation in the Junos OS PFE allows remote attackers to crash affected SRX and vSRX devices with malformed ESP packets. The PFE improperly validates an index, position, or offset while processing a malformed ESP packet for an established IPsec tunnel. Reachability requires PowerMode IPsec and a matching established tunnel; successful packets crash the PFE and interrupt forwarding.

CVSS severity7.5
High
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper index validation in the Junos OS PFE allows remote attackers to crash affected SRX and vSRX devices with malformed ESP packets. The PFE improperly validates an index, position, or offset while processing a malformed ESP packet for an established IPsec tunnel. Reachability requires PowerMode IPsec and a matching established tunnel; successful packets crash the PFE and interrupt forwarding.

The record

CVE
CVE-2022-22201
Published
Oct 18, 2022
Updated
May 12, 2025
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-20, CWE-1285, T1499
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=20.1 <20.1R3-S3
  2. Affected versionversion=20.2 <20.2R3-S4
  3. Affected versionversion=20.3 <20.3R3-S3
  4. Affected versionversion=20.4 <20.4R3-S2
  5. Affected versionversion=21.1 <21.1R3
  6. Affected versionversion=21.2 <21.2R3
  7. Affected versionversion=21.3 <21.3R1-S2, 21.3R2
  8. Affected versionversion=unspecified <19.4R2-S6, 19.4R3-S7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=20.1 <20.1R3-S3; version=20.2 <20.2R3-S4; version=20.3 <20.3R3-S3; version=20.4 <20.4R3-S2; version=21.1 <21.1R3; version=21.2 <21.2R3; version=21.3 <21.3R1-S2, 21.3R2; version=unspecified <19.4R2-S6, 19.4R3-S7

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 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-20Improper Input Validation
CWE-1285Improper Validation of Specified Index, Position, or Offset in Input
T1499Endpoint Denial of Service

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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