CVE-2024-21594: Junos OS: SRX 5000 Series: Repeated execution of a specific CLI command causes a flowd crash
Description
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.fpc.pic.
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.
Classification
CVE ID: CVE-2024-21594
CVSS Base Severity: MEDIUM
CVSS Base Score: 5.5
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Problem Types
CWE-122 Heap-based Buffer Overflow Denial of Service (DoS)Affected Products
Vendor: Juniper Networks
Product: Junos OS
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.02% (probability of being exploited)
EPSS Percentile: 4.42% (scored less or equal to compared to others)
EPSS Date: 2025-06-14 (when was this score calculated)
Stakeholder-Specific Vulnerability Categorization (SSVC)
SSVC Exploitation: none
SSVC Technical Impact: partial
SSVC Automatable: false
References
https://nvd.nist.gov/vuln/detail/CVE-2024-21594https://supportportal.juniper.net/JSA75733
https://www.first.org/cvss/calculator/4.0#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