CVE-2022-22156Network attack vector

Script replacement via unvalidated HTTPS certificates

Published Jan 19, 2022 · Updated Sep 17, 2024

Improper certificate validation in Juniper Networks Junos OS allows man-in-the-middle attackers to replace HTTPS-fetched system scripts. The system-script fetch path accepts an HTTPS server without validating its certificate, allowing an intercepted response to overwrite a local commit, event, extension-service, op, or SNMP script. An administrator with maintenance privilege must invoke the refresh operation, and the attacker must intercept that connection; substituted content compromises device integrity and confidentiality.

CVSS severity7.4
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Juniper Networks Junos OS allows man-in-the-middle attackers to replace HTTPS-fetched system scripts. The system-script fetch path accepts an HTTPS server without validating its certificate, allowing an intercepted response to overwrite a local commit, event, extension-service, op, or SNMP script. An administrator with maintenance privilege must invoke the refresh operation, and the attacker must intercept that connection; substituted content compromises device integrity and confidentiality.

The record

CVE
CVE-2022-22156
Published
Jan 19, 2022
Updated
Sep 17, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-358, CWE-295, CWE-300, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=19.1 <19.1R2-S3, 19.1R3-S7
  2. Affected versionversion=19.2 <19.2R1-S7, 19.2R3-S3
  3. Affected versionversion=19.3 <19.3R3-S4
  4. Affected versionversion=19.4 <19.4R3-S7
  5. Affected versionversion=20.1 <20.1R2-S2, 20.1R3
  6. Affected versionversion=20.2 <20.2R3
  7. Affected versionversion=20.3 <20.3R2-S1, 20.3R3
  8. Affected versionversion=20.4 <20.4R2
  9. Affected versionversion=21.1 <21.1R1-S1, 21.1R2
  10. Affected versionversion=unspecified <18.4R2-S9, 18.4R3-S9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=19.1 <19.1R2-S3, 19.1R3-S7; version=19.2 <19.2R1-S7, 19.2R3-S3; version=19.3 <19.3R3-S4; version=19.4 <19.4R3-S7; version=20.1 <20.1R2-S2, 20.1R3; version=20.2 <20.2R3; version=20.3 <20.3R2-S1, 20.3R3; version=20.4 <20.4R2; version=21.1 <21.1R1-S1, 21.1R2; version=unspecified <18.4R2-S9, 18.4R3-S9

Published CVSS scores

6.5Juniper Networks, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
7.4NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N

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-358Improperly Implemented Security Check for Standard
CWE-295Improper Certificate Validation
CWE-300Channel Accessible by Non-Endpoint
T1557Adversary-in-the-Middle

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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