CVE-2023-44189

Network disruption via bypassed MAC address validation

Published Oct 11, 2023 · Updated Sep 18, 2024

Origin validation error in Junos OS Evolved on PTX10003 Series routers allows network-adjacent attackers to interrupt downstream traffic. Its MAC address validation forwards frames bearing addresses not intended for the adjacent LAN whenever a valid route is present. No special configuration or authentication is required; the resulting Layer 2 loop congests the downstream domain and interrupts service.

CVSS severity6.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in Junos OS Evolved on PTX10003 Series routers allows network-adjacent attackers to interrupt downstream traffic. Its MAC address validation forwards frames bearing addresses not intended for the adjacent LAN whenever a valid route is present. No special configuration or authentication is required; the resulting Layer 2 loop congests the downstream domain and interrupts service.

The record

CVE
CVE-2023-44189
Published
Oct 11, 2023
Updated
Sep 18, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-346, T1498
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 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

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <21.4R3-S4-EVO
  2. Affected versionversion=22.1 <22.1R3-S3-EVO
  3. Affected versionversion=22.2R1-EVO <22.2*-EVO
  4. Affected versionversion=22.3 <22.3R2-S2-EVO, 22.3R3-S1-EVO
  5. Affected versionversion=22.4 <22.4R2-S1-EVO, 22.4R3-EVO
  6. Affected versionversion=23.2 <23.2R2-EVO

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=0 <21.4R3-S4-EVO; version=22.1 <22.1R3-S3-EVO; version=22.2R1-EVO <22.2*-EVO; version=22.3 <22.3R2-S2-EVO, 22.3R3-S1-EVO; version=22.4 <22.4R2-S1-EVO, 22.4R3-EVO; version=23.2 <23.2R2-EVO

Published CVSS scores

6.1Juniper Networks, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
5.4NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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-346Origin Validation Error
T1498Network Denial of Service

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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