CVE-2024-39511
Junos OS: The 802.1X Authentication Daemon crashes on running a specific command
An Improper Input Validation vulnerability in the 802.1X Authentication (dot1x) Daemon of Juniper Networks Junos OS allows a local, low-privileged attacker with access to the CLI to cause a Denial of Service (DoS).
On running a specific operational dot1x command, the dot1x daemon crashes. An attacker can cause a sustained DoS condition by running this command repeatedly.
When the crash occurs, the authentication status of any 802.1x clients is cleared, and any authorized dot1x port becomes unauthorized. The client cannot re-authenticate until the dot1x daemon restarts.
This issue affects Junos OS:
- All versions before 20.4R3-S10;
- 21.2 versions before 21.2R3-S7;
- 21.4 versions before 21.4R3-S6;
- 22.1 versions before 22.1R3-S5;
- 22.2 versions before 22.2R3-S3;
- 22.3 versions before 22.3R3-S2;
- 22.4 versions before 22.4R3-S1;
- 23.2 versions before 23.2R2.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS: The 802.1X Authentication Daemon crashes on running a specific command
An Improper Input Validation vulnerability in the 802.1X Authentication (dot1x) Daemon of Juniper Networks Junos OS allows a local, low-privileged attacker with access to the CLI to cause a Denial of Service (DoS).
On running a specific operational dot1x command, the dot1x daemon crashes. An attacker can cause a sustained DoS condition by running this command repeatedly.
When the crash occurs, the authentication status of any 802.1x clients is cleared, and any authorized dot1x port becomes unauthorized. The client cannot re-authenticate until the dot1x daemon restarts.
This issue affects Junos OS:
- All versions before 20.4R3-S10;
- 21.2 versions before 21.2R3-S7;
- 21.4 versions before 21.4R3-S6;
- 22.1 versions before 22.1R3-S5;
- 22.2 versions before 22.2R3-S3;
- 22.3 versions before 22.3R3-S2;
- 22.4 versions before 22.4R3-S1;
- 23.2 versions before 23.2R2.
- Record
CVE-2024-39511- CVSS 4.0
- 6.8 Medium
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 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
EUVDEUVD-2024-38037
An Improper Input Validation vulnerability in the 802.1X Authentication (dot1x) Daemon of Juniper Networks Junos OS allows a local, low-privileged attacker with access to the CLI to cause a Denial of Service (DoS).
On running a specific operational dot1x command, the dot1x daemon crashes. An attacker can cause a sustained DoS condition by running this command repeatedly.
When the crash occurs, the authentication status of any 802.1x clients is cleared, and any authorized dot1x port becomes unauthorized. The client cannot re-authenticate until the dot1x daemon restarts.
This issue affects Junos OS:
- All versions before 20.4R3-S10;
- 21.2 versions before 21.2R3-S7;
- 21.4 versions before 21.4R3-S6;
- 22.1 versions before 22.1R3-S5;
- 22.2 versions before 22.2R3-S3;
- 22.3 versions before 22.3R3-S2;
- 22.4 versions before 22.4R3-S1;
- 23.2 versions before 23.2R2.
- Record
EUVD-2024-38037- CVSS 4.0
- 6.8 Medium
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 - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g643-7wqc-f2xg
An Improper Input Validation vulnerability in the 802.1X Authentication (dot1x) Daemon of Juniper...
An Improper Input Validation vulnerability in the 802.1X Authentication (dot1x) Daemon of Juniper Networks Junos OS allows a local, low-privileged attacker with access to the CLI to cause a Denial of Service (DoS).
On running a specific operational dot1x command, the dot1x daemon crashes. An attacker can cause a sustained DoS condition by running this command repeatedly.
When the crash occurs, the authentication status of any 802.1x clients is cleared, and any authorized dot1x port becomes unauthorized. The client cannot re-authenticate until the dot1x daemon restarts.
This issue affects Junos OS:
- All versions before 20.4R3-S10;
- 21.2 versions before 21.2R3-S7;
- 21.4 versions before 21.4R3-S6;
- 22.1 versions before 22.1R3-S5;
- 22.2 versions before 22.2R3-S3;
- 22.3 versions before 22.3R3-S2;
- 22.4 versions before 22.4R3-S1;
- 23.2 versions before 23.2R2.
- Record
GHSA-g643-7wqc-f2xg- CVSS 4.0
- 6.8 Medium
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
NVD
An Improper Input Validation vulnerability in the 802.1X Authentication (dot1x) Daemon of Juniper Networks Junos OS allows a local, low-privileged attacker with access to the CLI to cause a Denial of Service (DoS).
On running a specific operational dot1x command, the dot1x daemon crashes. An attacker can cause a sustained DoS condition by running this command repeatedly.
When the crash occurs, the authentication status of any 802.1x clients is cleared, and any authorized dot1x port becomes unauthorized. The client cannot re-authenticate until the dot1x daemon restarts.
This issue affects Junos OS:
- All versions before 20.4R3-S10;
- 21.2 versions before 21.2R3-S7;
- 21.4 versions before 21.4R3-S6;
- 22.1 versions before 22.1R3-S5;
- 22.2 versions before 22.2R3-S3;
- 22.3 versions before 22.3R3-S2;
- 22.4 versions before 22.4R3-S1;
- 23.2 versions before 23.2R2.
- Record
CVE-2024-39511- CVSS 4.0
- 6.8 Medium
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-39511 is a medium vulnerability (CVSS 6.8) in Juniper Junos, published July 10, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 4th percentile. No source names a fixed version.