CVE-2024-21586
Junos OS: SRX Series and NFX Series: Specific valid traffic leads to a PFE crash
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition.
This issue affects Junos OS on SRX Series:
- 21.4 versions before 21.4R3-S7.9,
- 22.1 versions before 22.1R3-S5.3,
- 22.2 versions before 22.2R3-S4.11,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
This issue affects Junos OS on NFX Series:
- 21.4 versions before 21.4R3-S8,
- 22.1 versions after 22.1R1,
- 22.2 versions before 22.2R3-S5,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
Junos OS versions prior to 21.4R1 are not affected by this issue.
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: SRX Series and NFX Series: Specific valid traffic leads to a PFE crash
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition.
This issue affects Junos OS on SRX Series:
- 21.4 versions before 21.4R3-S7.9,
- 22.1 versions before 22.1R3-S5.3,
- 22.2 versions before 22.2R3-S4.11,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
This issue affects Junos OS on NFX Series:
- 21.4 versions before 21.4R3-S8,
- 22.1 versions after 22.1R1,
- 22.2 versions before 22.2R3-S5,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
Junos OS versions prior to 21.4R1 are not affected by this issue.
- Record
CVE-2024-21586- 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-2024-19234
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition.
This issue affects Junos OS on SRX Series:
- 21.4 versions before 21.4R3-S7.9,
- 22.1 versions before 22.1R3-S5.3,
- 22.2 versions before 22.2R3-S4.11,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
This issue affects Junos OS on NFX Series:
- 21.4 versions before 21.4R3-S8,
- 22.1 versions after 22.1R1,
- 22.2 versions before 22.2R3-S5,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
Junos OS versions prior to 21.4R1 are not affected by this issue.
- Record
EUVD-2024-19234- 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 - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-w2xf-42w4-qqrc
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding...
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If an SRX Series device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition.
This issue affects Junos OS on SRX Series:
- 21.4 versions before 21.4R3-S7.9,
- 22.1 versions before 22.1R3-S5.3,
- 22.2 versions before 22.2R3-S4.11,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
Junos OS versions prior to 21.4R1 are not affected by this issue.
- Record
GHSA-w2xf-42w4-qqrc- 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:Y/R:A/V:X/RE:M/U:Red - 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 Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series and NFX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If an affected device receives specific valid traffic destined to the device, it will cause the PFE to crash and restart. Continued receipt and processing of this traffic will create a sustained DoS condition.
This issue affects Junos OS on SRX Series:
- 21.4 versions before 21.4R3-S7.9,
- 22.1 versions before 22.1R3-S5.3,
- 22.2 versions before 22.2R3-S4.11,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
This issue affects Junos OS on NFX Series:
- 21.4 versions before 21.4R3-S8,
- 22.1 versions after 22.1R1,
- 22.2 versions before 22.2R3-S5,
- 22.3 versions before 22.3R3,
- 22.4 versions before 22.4R3.
Junos OS versions prior to 21.4R1 are not affected by this issue.
- Record
CVE-2024-21586- 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-2024-21586 is a high vulnerability (CVSS 7.5) in Juniper Junos, published July 1, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 42nd percentile. No source names a fixed version.