EUVD-2025-21139Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 7.5. EPSS 0.1%. No patch confirmed. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability in the affected application to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability. |
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Alert meAnalysisAIv1 – Mar 16, 2026
A denial of service vulnerability (CVSS 7.5) that allows an attacker sending a bgp update with a specifically malformed as path. High severity vulnerability requiring prompt remediation.
Earlier versions of this analysis (1)
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 malfo
RemediationAI
Monitor vendor channels for patch availability.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 2 packages in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
CWE-416 (Use After Free). CVSS 7.5 indicates high severity.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
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.
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.
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.
This issue affects:
Junos OS:
- All versions before 21.2R3-S9,
- all versions of 21.4,
- from 22.2 before 22.2R3-S6,
- from 22.4 before 22.4R3-S5,
- from 23.2 before 23.2R2-S3,
- from 23.4 before 23.4R2-S4,
- from 24.2 before 24.2R2;
Junos OS Evolved:
- All versions before 22.4R3-S5-EVO,
- from 23.2-EVO before 23.2R2-S3-EVO,
- from 23.4-EVO before 23.4R2-S4-EVO,
- from 24.2-EVO before 24.2R2-EVO.
This is a more complete fix for previously published CVE-2024-39549 (JSA83011).
Executive ViewAI
CVE-2025-52946 is a high-severity denial of service vulnerability affecting BGP implementations that can be triggered by a single malformed AS path update, potentially disrupting critical routing infrastructure and network availability. An attacker can remotely crash or hang BGP processes without authentication, making this a significant risk to any organization relying on BGP for core network operations.
Apply vendor patch. If immediate patching is not possible: (1) Implement strict BGP input validation and filtering at network edge to reject malformed AS path attributes; (2) configure BGP authentication (MD5/GTSM) to limit BGP peers to trusted sources only; (3) deploy rate limiting on BGP update processing; (4) establish automated BGP session monitoring and failover to detect sudden process termination.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
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GitHub PoC
Exploit-DB