CVE-2024-21594
Junos OS: SRX 5000 Series: Repeated execution of a specific CLI command causes a flowd crash
A Heap-based Buffer Overflow vulnerability in the Network Services Daemon (NSD) of Juniper Networks Junos OS allows authenticated, low privileged, local attacker to cause a Denial of Service (DoS).
On an SRX 5000 Series device, when executing a specific command repeatedly, memory is corrupted, which leads to a Flow Processing Daemon (flowd) crash.
The NSD process has to be restarted to restore services.
If this issue occurs, it can be checked with the following command:
user@host> request security policies check The following log message can also be observed:
Error: policies are out of sync for PFE node<number>.fpc<number>.pic<number>. This issue affects:
Juniper Networks Junos OS on SRX 5000 Series
- All versions earlier than 20.4R3-S6;
- 21.1 versions earlier than 21.1R3-S5;
- 21.2 versions earlier than 21.2R3-S4;
- 21.3 versions earlier than 21.3R3-S3;
- 21.4 versions earlier than 21.4R3-S3;
- 22.1 versions earlier than 22.1R3-S1;
- 22.2 versions earlier than 22.2R3;
- 22.3 versions earlier than 22.3R2.
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: SRX 5000 Series: Repeated execution of a specific CLI command causes a flowd crash
A Heap-based Buffer Overflow vulnerability in the Network Services Daemon (NSD) of Juniper Networks Junos OS allows authenticated, low privileged, local attacker to cause a Denial of Service (DoS).
On an SRX 5000 Series device, when executing a specific command repeatedly, memory is corrupted, which leads to a Flow Processing Daemon (flowd) crash.
The NSD process has to be restarted to restore services.
If this issue occurs, it can be checked with the following command:
user@host> request security policies check The following log message can also be observed:
Error: policies are out of sync for PFE node<number>.fpc<number>.pic<number>. This issue affects:
Juniper Networks Junos OS on SRX 5000 Series
- All versions earlier than 20.4R3-S6;
- 21.1 versions earlier than 21.1R3-S5;
- 21.2 versions earlier than 21.2R3-S4;
- 21.3 versions earlier than 21.3R3-S3;
- 21.4 versions earlier than 21.4R3-S3;
- 22.1 versions earlier than 22.1R3-S1;
- 22.2 versions earlier than 22.2R3;
- 22.3 versions earlier than 22.3R2.
- Record
CVE-2024-21594- 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-122
- Updated
- 2026-11-02
EUVDEUVD-2024-19242
A Heap-based Buffer Overflow vulnerability in the Network Services Daemon (NSD) of Juniper Networks Junos OS allows authenticated, low privileged, local attacker to cause a Denial of Service (DoS).
On an SRX 5000 Series device, when executing a specific command repeatedly, memory is corrupted, which leads to a Flow Processing Daemon (flowd) crash.
The NSD process has to be restarted to restore services.
If this issue occurs, it can be checked with the following command:
user@host> request security policies check The following log message can also be observed:
Error: policies are out of sync for PFE node<number>.fpc<number>.pic<number>. This issue affects:
Juniper Networks Junos OS on SRX 5000 Series
- All versions earlier than 20.4R3-S6;
- 21.1 versions earlier than 21.1R3-S5;
- 21.2 versions earlier than 21.2R3-S4;
- 21.3 versions earlier than 21.3R3-S3;
- 21.4 versions earlier than 21.4R3-S3;
- 22.1 versions earlier than 22.1R3-S1;
- 22.2 versions earlier than 22.2R3;
- 22.3 versions earlier than 22.3R2.
- Record
EUVD-2024-19242- 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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c34w-cgqm-j3j9
A Heap-based Buffer Overflow vulnerability in the Network Services Daemon (NSD) of Juniper...
A Heap-based Buffer Overflow vulnerability in the Network Services Daemon (NSD) of Juniper Networks Junos OS allows authenticated, low privileged, local attacker to cause a Denial of Service (DoS).
On an SRX 5000 Series device, when executing a specific command repeatedly, memory is corrupted, which leads to a Flow Processing Daemon (flowd) crash.
The NSD process has to be restarted to restore services.
If this issue occurs, it can be checked with the following command:
user@host> request security policies check The following log message can also be observed:
Error: policies are out of sync for PFE node<number>.fpc<number>.pic<number>. This issue affects:
Juniper Networks Junos OS on SRX 5000 Series
- All versions earlier than 20.4R3-S6;
- 21.1 versions earlier than 21.1R3-S5;
- 21.2 versions earlier than 21.2R3-S4;
- 21.3 versions earlier than 21.3R3-S3;
- 21.4 versions earlier than 21.4R3-S3;
- 22.1 versions earlier than 22.1R3-S1;
- 22.2 versions earlier than 22.2R3;
- 22.3 versions earlier than 22.3R2.
- Record
GHSA-c34w-cgqm-j3j9- 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-122, CWE-787
- Updated
- 2026-11-02
NVD
A Heap-based Buffer Overflow vulnerability in the Network Services Daemon (NSD) of Juniper Networks Junos OS allows authenticated, low privileged, local attacker to cause a Denial of Service (DoS).
On an SRX 5000 Series device, when executing a specific command repeatedly, memory is corrupted, which leads to a Flow Processing Daemon (flowd) crash.
The NSD process has to be restarted to restore services.
If this issue occurs, it can be checked with the following command:
user@host> request security policies check The following log message can also be observed:
Error: policies are out of sync for PFE node<number>.fpc<number>.pic<number>. This issue affects:
Juniper Networks Junos OS on SRX 5000 Series
- All versions earlier than 20.4R3-S6;
- 21.1 versions earlier than 21.1R3-S5;
- 21.2 versions earlier than 21.2R3-S4;
- 21.3 versions earlier than 21.3R3-S3;
- 21.4 versions earlier than 21.4R3-S3;
- 22.1 versions earlier than 22.1R3-S1;
- 22.2 versions earlier than 22.2R3;
- 22.3 versions earlier than 22.3R2.
- Record
CVE-2024-21594- 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-122, CWE-787
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-21594 is a medium vulnerability (CVSS 5.5) in Juniper Junos, published January 12, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. No source names a fixed version.