CVE-2024-39530
Junos OS: Attempting to access specific sensors on platforms not supporting these will lead to a chassisd crash
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis management daemon (chassisd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a
Denial-of-Service (DoS).
If an attempt is made to access specific sensors on platforms not supporting these sensors, either via GRPC or netconf, chassisd will crash and restart leading to a restart of all FPCs and thereby a complete outage.
This issue affects Junos OS:
- 21.4 versions from 21.4R3 before 21.4R3-S5,
- 22.1 versions from 22.1R3 before 22.1R3-S4,
- 22.2 versions from 22.2R2 before 22.2R3,
- 22.3 versions from 22.3R1 before 22.3R2-S2, 22.3R3,
- 22.4 versions from 22.4R1 before 22.4R2.
This issue does not affect Junos OS versions earlier than 21.4.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- 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: Attempting to access specific sensors on platforms not supporting these will lead to a chassisd crash
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis management daemon (chassisd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a
Denial-of-Service (DoS).
If an attempt is made to access specific sensors on platforms not supporting these sensors, either via GRPC or netconf, chassisd will crash and restart leading to a restart of all FPCs and thereby a complete outage.
This issue affects Junos OS:
- 21.4 versions from 21.4R3 before 21.4R3-S5,
- 22.1 versions from 22.1R3 before 22.1R3-S4,
- 22.2 versions from 22.2R2 before 22.2R3,
- 22.3 versions from 22.3R1 before 22.3R2-S2, 22.3R3,
- 22.4 versions from 22.4R1 before 22.4R2.
This issue does not affect Junos OS versions earlier than 21.4.
- Record
CVE-2024-39530- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
EUVDEUVD-2024-38056
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis management daemon (chassisd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a
Denial-of-Service (DoS).
If an attempt is made to access specific sensors on platforms not supporting these sensors, either via GRPC or netconf, chassisd will crash and restart leading to a restart of all FPCs and thereby a complete outage.
This issue affects Junos OS:
- 21.4 versions from 21.4R3 before 21.4R3-S5,
- 22.1 versions from 22.1R3 before 22.1R3-S4,
- 22.2 versions from 22.2R2 before 22.2R3,
- 22.3 versions from 22.3R1 before 22.3R2-S2, 22.3R3,
- 22.4 versions from 22.4R1 before 22.4R2.
This issue does not affect Junos OS versions earlier than 21.4.
- Record
EUVD-2024-38056- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jfwc-jh6j-8hrp
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis management...
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis management daemon (chassisd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a
Denial-of-Service (DoS).
If an attempt is made to access specific sensors on platforms not supporting these sensors, either via GRPC or netconf, chassisd will crash and restart leading to a restart of all FPCs and thereby a complete outage.
This issue affects Junos OS:
- 21.4 versions from 21.4R3 before 21.4R3-S5,
- 22.1 versions from 22.1R3 before 22.1R3-S4,
- 22.2 versions from 22.2R2 before 22.2R3,
- 22.3 versions from 22.3R1 before 22.3R2-S2, 22.3R3,
- 22.4 versions from 22.4R1 before 22.4R2.
This issue does not affect Junos OS versions earlier than 21.4.
- Record
GHSA-jfwc-jh6j-8hrp- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
NVD
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis management daemon (chassisd) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a
Denial-of-Service (DoS).
If an attempt is made to access specific sensors on platforms not supporting these sensors, either via GRPC or netconf, chassisd will crash and restart leading to a restart of all FPCs and thereby a complete outage.
This issue affects Junos OS:
- 21.4 versions from 21.4R3 before 21.4R3-S5,
- 22.1 versions from 22.1R3 before 22.1R3-S4,
- 22.2 versions from 22.2R2 before 22.2R3,
- 22.3 versions from 22.3R1 before 22.3R2-S2, 22.3R3,
- 22.4 versions from 22.4R1 before 22.4R2.
This issue does not affect Junos OS versions earlier than 21.4.
- Record
CVE-2024-39530- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- 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-2024-39530 is a high vulnerability (CVSS 8.7) in Juniper Junos, published July 11, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.48%, the 41st percentile. No source names a fixed version.