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CVE-2025-52981: Denial-of-service Vulnerability in Juniper Networks Junos OS

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Overview

This report presents a detailed analysis of the CVE-2025-52981 vulnerability, a critical security issue affecting Juniper Networks Junos OS. This vulnerability allows an unauthenticated, network-based threat actor to cause a Denial-of-Service (DoS) condition. The impact of this vulnerability on affected systems is significant, potentially leading to system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-52981
Severity: High (7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service, potential system compromise, and data leakage

Affected Products

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Product | Affected Versions

Junos OS | All versions before 21.2R3-S9
Junos OS | 21.4 versions before 21.4R3-S11
Junos OS | 22.2 versions before 22.2R3-S7
Junos OS | 22.4 versions before 22.4R3-S6
Junos OS | 23.2 versions before 23.2R2-S4
Junos OS | 23.4 versions before 23.4R2-S4
Junos OS | 24.2 versions before 24.2R2

How the Exploit Works

The vulnerability exists because of an improper check for unusual or exceptional conditions in the flow processing daemon (flowd) of Juniper Networks Junos OS. If a sequence of specific PIM packets is received, it can trigger a flaw in the flowd process, causing it to crash and restart. Consequently, this results in a Denial-of-Service (DoS) condition.

Conceptual Example Code

This is a conceptual representation of the exploit. It does not represent an actual exploit code but rather illustrates the type of packet sequence that could trigger the vulnerability:

# Send a sequence of specific PIM packets
packet1 = PIM(type="SPECIAL", data="...")
packet2 = PIM(type="SPECIAL", data="...")
packet3 = PIM(type="SPECIAL", data="...")
# Send the packets to the target
send(packet1, target="target.example.com")
send(packet2, target="target.example.com")
send(packet3, target="target.example.com")

Please note: This is a hypothetical representation and does not represent an actual exploit code. The real-world execution would require a more complex sequence of actions.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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