CVE-2025-52946
Severity CVSS v4.0:
HIGH
Type:
CWE-416
Use After Free
Publication date:
11/07/2025
Last modified:
11/07/2025
Description
A Use After Free vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an attacker sending a BGP update with a specifically malformed AS PATH to cause rpd to crash, resulting in a Denial of Service (DoS). Continuous receipt of the malformed AS PATH attribute will cause a sustained DoS condition.<br />
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On all Junos OS and Junos OS Evolved platforms, the rpd process will crash and restart when a specifically malformed AS PATH is received within a BGP update and traceoptions are enabled.<br />
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This issue only affects systems with BGP traceoptions enabled and requires a BGP session to be already established. Systems without BGP traceoptions enabled are not impacted by this issue.<br />
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This issue affects:<br />
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Junos OS:<br />
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* All versions before 21.2R3-S9, <br />
* all versions of 21.4,<br />
* from 22.2 before 22.2R3-S6, <br />
* from 22.4 before 22.4R3-S5, <br />
* from 23.2 before 23.2R2-S3, <br />
* from 23.4 before 23.4R2-S4, <br />
* from 24.2 before 24.2R2; <br />
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Junos OS Evolved: <br />
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* All versions before 22.4R3-S5-EVO, <br />
* from 23.2-EVO before 23.2R2-S3-EVO, <br />
* from 23.4-EVO before 23.4R2-S4-EVO, <br />
* from 24.2-EVO before 24.2R2-EVO.<br />
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This is a more complete fix for previously published CVE-2024-39549 (JSA83011).
Impact
Base Score 4.0
8.70
Severity 4.0
HIGH
Base Score 3.x
7.50
Severity 3.x
HIGH