CVE-2025-30659
Remediation / Mitigation Strategy: CVE-2025-30659
Vulnerability Description:
An Improper Handling of Length Parameter Inconsistency vulnerability exists in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on SRX Series devices. Specifically, when a device configured for Secure Vector Routing (SVR) receives a specifically malformed packet, the PFE will crash and restart, leading to a Denial-of-Service (DoS).
Severity:
- CVSS v3 Base Score: 8.7 (High)
Affected Versions:
- Junos OS on SRX Series:
- All 21.4 versions
- 22.2 versions before 22.2R3-S6
- 22.4 versions before 22.4R3-S6
- 23.2 versions before 23.2R2-S3
- 23.4 versions before 23.4R2-S4
- 24.2 versions before 24.2R2
Known Exploit:
A specifically crafted malformed packet, when received by a device configured for SVR, will trigger the PFE crash. The details of the malformed packet are not publicly available but can be reverse-engineered from the patch.
Remediation Steps:
Upgrade Junos OS: The primary remediation is to upgrade Junos OS on affected SRX Series devices to a fixed version. Refer to the “Affected Versions” section above. Upgrade to the recommended release or a later version that addresses the vulnerability.
- 22.2R3-S6 or later
- 22.4R3-S6 or later
- 23.2R2-S3 or later
- 23.4R2-S4 or later
- 24.2R2 or later
Patch Management: Ensure a robust patch management process is in place to quickly deploy security updates as they become available.
Mitigation Steps (if immediate upgrade is not possible):
There are no reliable mitigation steps that do not impact functionality if immediate upgrade is not possible.
Verification:
- After upgrading, monitor the SRX Series devices for stability and any signs of unexpected crashes or restarts.
- Perform penetration testing or vulnerability scanning to confirm that the vulnerability has been successfully remediated.
- Review system logs for any errors or warnings related to the PFE.
Long-Term Preventative Measures:
- Security Hardening: Implement network security best practices, including firewall rules and intrusion detection/prevention systems, to minimize the attack surface.
- Vulnerability Scanning: Regularly conduct vulnerability scans to identify and address potential security weaknesses.
- Vendor Notifications: Subscribe to security advisories from Juniper Networks to stay informed about potential vulnerabilities and available patches.
- Network Segmentation: Segment the network to limit the impact of a successful attack on a single device. This doesn’t mitigate the vulnerability, but reduces the overall risk.
Assigner
- Juniper Networks, Inc. [email protected]
Date
- Published Date: 2025-04-09 20:15:30
- Updated Date: 2025-04-09 20:15:30