CVE-2022-22176

Adjacent DHCP denial of service via malformed requests

Published Jan 19, 2022 · Updated Sep 16, 2024

Improper input validation in Juniper Networks Junos OS allows adjacent unauthenticated attackers to crash jdhcpd with a malformed DHCP request. When option 82 is configured, jdhcpd accepts a specifically malformed request instead of rejecting its invalid syntax and crashes. Exposure requires DHCP snooping or dhcp-security with option 82 configured; repeated packets sustain DHCP service unavailability.

CVSS severity7.4
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Juniper Networks Junos OS allows adjacent unauthenticated attackers to crash jdhcpd with a malformed DHCP request. When option 82 is configured, jdhcpd accepts a specifically malformed request instead of rejecting its invalid syntax and crashes. Exposure requires DHCP snooping or dhcp-security with option 82 configured; repeated packets sustain DHCP service unavailability.

The record

CVE
CVE-2022-22176
Published
Jan 19, 2022
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-1286, CWE-20, T1499.004
Attack vector
adjacent
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

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=13.2R1 <13.2*
  2. Affected versionversion=18.3 <18.3R3-S6
  3. Affected versionversion=18.4 <18.4R2-S9, 18.4R3-S10
  4. Affected versionversion=19.1 <19.1R2-S3, 19.1R3-S7
  5. Affected versionversion=19.2 <19.2R1-S8, 19.2R3-S4
  6. Affected versionversion=19.3 <19.3R2-S7, 19.3R3-S4
  7. Affected versionversion=19.4 <19.4R3-S6
  8. Affected versionversion=20.1 <20.1R3-S3
  9. Affected versionversion=20.2 <20.2R3-S3
  10. Affected versionversion=20.3 <20.3R3-S1
  11. Affected versionversion=20.4 <20.4R3
  12. Affected versionversion=21.1 <21.1R2-S1, 21.1R3
  13. Affected versionversion=21.2 <21.2R1-S1, 21.2R2
  14. Affected versionversion=unspecified <15.1R7-S11

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=13.2R1 <13.2*; version=18.3 <18.3R3-S6; version=18.4 <18.4R2-S9, 18.4R3-S10; version=19.1 <19.1R2-S3, 19.1R3-S7; version=19.2 <19.2R1-S8, 19.2R3-S4; version=19.3 <19.3R2-S7, 19.3R3-S4; version=19.4 <19.4R3-S6; version=20.1 <20.1R3-S3; version=20.2 <20.2R3-S3; version=20.3 <20.3R3-S1; version=20.4 <20.4R3; version=21.1 <21.1R2-S1, 21.1R3; version=21.2 <21.2R1-S1, 21.2R2; version=unspecified <15.1R7-S11

Published CVSS scores

2.9NIST NVDAV:A/AC:M/Au:N/C:N/I:N/A:P
6.5NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.4Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1286Improper Validation of Syntactic Correctness of Input
CWE-20Improper Input Validation
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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