CVE-2022-22173Network attack vector

Denial of service via failed CRL memory release

Published Jan 19, 2022 · Updated Sep 16, 2024

Memory leakage in the pkid daemon in affected Juniper Networks Junos OS releases allows remote attackers to interrupt the system. When a configured CRL URL fails to download, pkid retains the memory allocated for that CRL; repeated failures consume all available memory and leave the system inoperable. Exposure requires a PKI CA profile configured for CRL URL revocation checking, while no authentication or user interaction is required.

CVSS severity7.5
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in the pkid daemon in affected Juniper Networks Junos OS releases allows remote attackers to interrupt the system. When a configured CRL URL fails to download, pkid retains the memory allocated for that CRL; repeated failures consume all available memory and leave the system inoperable. Exposure requires a PKI CA profile configured for CRL URL revocation checking, while no authentication or user interaction is required.

The record

CVE
CVE-2022-22173
Published
Jan 19, 2022
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-401, T1499.004
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

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=18.4 <18.4R2-S9, 18.4R3-S10
  2. Affected versionversion=19.1 <19.1R2-S3, 19.1R3-S7
  3. Affected versionversion=19.2 <19.2R1-S8, 19.2R3-S4
  4. Affected versionversion=19.3 <19.3R3-S4
  5. Affected versionversion=19.4 <19.4R2-S5, 19.4R3-S5
  6. Affected versionversion=20.1 <20.1R3-S1
  7. Affected versionversion=20.2 <20.2R3-S2
  8. Affected versionversion=20.3 <20.3R3-S1
  9. Affected versionversion=20.4 <20.4R3
  10. Affected versionversion=21.1 <21.1R2, 21.1R3
  11. Affected versionversion=21.2 <21.2R1-S1, 21.2R2
  12. Affected versionversion=unspecified <18.3R3-S6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=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 <19.3R3-S4; version=19.4 <19.4R2-S5, 19.4R3-S5; version=20.1 <20.1R3-S1; version=20.2 <20.2R3-S2; version=20.3 <20.3R3-S1; version=20.4 <20.4R3; version=21.1 <21.1R2, 21.1R3; version=21.2 <21.2R1-S1, 21.2R2; version=unspecified <18.3R3-S6

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NIST 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 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-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

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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