CVE-2023-44183

Service interruption via VxLAN PFE DMA leak

Published Oct 12, 2023 · Updated Sep 18, 2024

Improper input validation in the VxLAN PFE in Junos OS on QFX5000 and EX4600 devices allows attackers to interrupt service. Under specific operational conditions, the PFE mishandles two or more genuine packets within the same VxLAN topology and leaks DMA memory. No authentication is required, but the attacker must share the VxLAN; affected devices can lose FPC0 and interfaces for 10 to 20 minutes.

CVSS severity6.5
Medium
EPSS probability0.32%
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 the VxLAN PFE in Junos OS on QFX5000 and EX4600 devices allows attackers to interrupt service. Under specific operational conditions, the PFE mishandles two or more genuine packets within the same VxLAN topology and leaks DMA memory. No authentication is required, but the attacker must share the VxLAN; affected devices can lose FPC0 and interfaces for 10 to 20 minutes.

The record

CVE
CVE-2023-44183
Published
Oct 12, 2023
Updated
Sep 18, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-401, CWE-20, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=18.4R2 <18.4*
  2. Affected versionversion=20.4 <20.4R3-S8
  3. Affected versionversion=21.1R1 <21.1*
  4. Affected versionversion=21.2 <21.2R3-S6
  5. Affected versionversion=21.3 <21.3R3-S5
  6. Affected versionversion=21.4 <21.4R3-S4
  7. Affected versionversion=22.1 <22.1R3-S3
  8. Affected versionversion=22.2 <22.2R3-S1
  9. Affected versionversion=22.3 <22.3R2-S2, 22.3R3
  10. Affected versionversion=22.4 <22.4R2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=18.4R2 <18.4*; version=20.4 <20.4R3-S8; version=21.1R1 <21.1*; version=21.2 <21.2R3-S6; version=21.3 <21.3R3-S5; version=21.4 <21.4R3-S4; version=22.1 <22.1R3-S3; version=22.2 <22.2R3-S1; version=22.3 <22.3R2-S2, 22.3R3; version=22.4 <22.4R2

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5Juniper NetworksCVSS: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 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-401Missing Release of Memory after Effective Lifetime
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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