CVE-2023-36848

FPC crash via malformed CFM packet

Published Jul 14, 2023 · Updated Oct 22, 2024

Improper handling of undefined values in Junos OS PPMD on affected MX Series releases allows attackers to crash the FPC. PPMD mishandles an undefined value while processing a malformed Connectivity Fault Management packet, causing the Flexible PIC Concentrator to crash. The packet must reach an interface with CFM configured; continued delivery sustains the service interruption, while confidentiality and integrity remain unaffected.

CVSS severity6.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper handling of undefined values in Junos OS PPMD on affected MX Series releases allows attackers to crash the FPC. PPMD mishandles an undefined value while processing a malformed Connectivity Fault Management packet, causing the Flexible PIC Concentrator to crash. The packet must reach an interface with CFM configured; continued delivery sustains the service interruption, while confidentiality and integrity remain unaffected.

The record

CVE
CVE-2023-36848
Published
Jul 14, 2023
Updated
Oct 22, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-232, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=19.2 <19.2R3-S7
  2. Affected versionversion=19.3 <19.3R3-S8
  3. Affected versionversion=19.4 <19.4R3-S12
  4. Affected versionversion=20.1 <20.1*
  5. Affected versionversion=20.2 <20.2R3-S8
  6. Affected versionversion=20.3 <20.3*
  7. Affected versionversion=20.4 <20.4R3-S7
  8. Affected versionversion=21.1 <21.1R3-S5
  9. Affected versionversion=21.2 <21.2R3-S5
  10. Affected versionversion=21.3 <21.3R3-S4
  11. Affected versionversion=21.4 <21.4R3-S4
  12. Affected versionversion=22.1 <22.1R3-S3
  13. Affected versionversion=22.2 <22.2R3-S1
  14. Affected versionversion=22.3 <22.3R3
  15. Affected versionversion=22.4 <22.4R1-S2, 22.4R2
  16. Affected versionversion=unspecified <19.1R3-S10

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=19.2 <19.2R3-S7; version=19.3 <19.3R3-S8; version=19.4 <19.4R3-S12; version=20.1 <20.1*; version=20.2 <20.2R3-S8; version=20.3 <20.3*; version=20.4 <20.4R3-S7; version=21.1 <21.1R3-S5; version=21.2 <21.2R3-S5; version=21.3 <21.3R3-S4; version=21.4 <21.4R3-S4; version=22.1 <22.1R3-S3; version=22.2 <22.2R3-S1; version=22.3 <22.3R3; version=22.4 <22.4R1-S2, 22.4R2; version=unspecified <19.1R3-S10

Published CVSS scores

6.5Juniper Networks, Inc.CVSS:3.1/AV:A/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-232Improper Handling of Undefined Values
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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