CVE-2024-39511

Local 802.1X outage via dot1x command crash

Published Jul 10, 2024 · Updated Aug 2, 2024

Improper input validation in affected Junos OS releases allows local users with low-privileged CLI access to interrupt 802.1X authentication. A specific operational dot1x command reaches improperly validated input and crashes the daemon, but Juniper has not disclosed the exact command or rejected value. The crash clears client authentication state and makes authorized ports unauthorized until the daemon restarts; repeated execution sustains the outage.

CVSS severity6.8
Medium
EPSS probability0.15%
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 affected Junos OS releases allows local users with low-privileged CLI access to interrupt 802.1X authentication. A specific operational dot1x command reaches improperly validated input and crashes the daemon, but Juniper has not disclosed the exact command or rejected value. The crash clears client authentication state and makes authorized ports unauthorized until the daemon restarts; repeated execution sustains the outage.

The record

CVE
CVE-2024-39511
Published
Jul 10, 2024
Updated
Aug 2, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-20, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 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

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=0 <20.4R3-S10
  2. Affected versionversion=21.2 <21.2R3-S7
  3. Affected versionversion=21.4 <21.4R3-S6
  4. Affected versionversion=22.1 <22.1R3-S5
  5. Affected versionversion=22.2 <22.2R3-S3
  6. Affected versionversion=22.3 <22.3R3-S2
  7. Affected versionversion=22.4 <22.4R3-S1
  8. Affected versionversion=23.2 <23.2R2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Juniper Networks · Junos OSversion=0 <20.4R3-S10; version=21.2 <21.2R3-S7; version=21.4 <21.4R3-S6; version=22.1 <22.1R3-S5; version=22.2 <22.2R3-S3; version=22.3 <22.3R3-S2; version=22.4 <22.4R3-S1; version=23.2 <23.2R2

Published CVSS scores

5.5Juniper Networks, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8Juniper Networks, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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