CVE-2024-30403

Adjacent service interruption via MAC-learning interface flap

Published Apr 12, 2024 · Updated Aug 2, 2024

NULL pointer dereference in the PFE of Junos OS Evolved 23.2-EVO allows attackers on an adjacent network to restart the PFE. During MAC learning for Layer 2 traffic on a logical interface, an interface flap causes evo-aftmand-bt to dereference a NULL pointer and core. Repeating the sequence restarts the Packet Forwarding Engine each time, sustaining a forwarding outage without credentials from the adjacent network.

CVSS severity7.1
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the PFE of Junos OS Evolved 23.2-EVO allows attackers on an adjacent network to restart the PFE. During MAC learning for Layer 2 traffic on a logical interface, an interface flap causes evo-aftmand-bt to dereference a NULL pointer and core. Repeating the sequence restarts the Packet Forwarding Engine each time, sustaining a forwarding outage without credentials from the adjacent network.

The record

CVE
CVE-2024-30403
Published
Apr 12, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS Evolved
Classifications
CWE-476, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=23.2-evo <23.2r1-s1-evo
  2. Affected versionversion=23.2-EVO <23.2R1-S1-EVO, 23.2R2-EVO
  3. Affected versionversion=23.2-evo <23.2r2-evo

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OS Evolvedversion=23.2-evo <23.2r1-s1-evo; version=23.2-EVO <23.2R1-S1-EVO, 23.2R2-EVO; version=23.2-evo <23.2r2-evo

Published CVSS scores

6.5Juniper NetworksCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1Juniper NetworksCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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 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-476NULL Pointer Dereference
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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