CVE-2014-2713 in Junos
Summary
by MITRE
Juniper Junos before 11.4R11, 12.1 before 12.1R9, 12.2 before 12.2R7, 12.3R4 before 12.3R4-S3, 13.1 before 13.1R4, 13.2 before 13.2R2, and 13.3 before 13.3R1, as used in MX Series and T4000 routers, allows remote attackers to cause a denial of service (PFE restart) via a crafted IP packet to certain (1) Trio or (2) Cassis-based Packet Forwarding Engine (PFE) modules.
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Analysis
by VulDB Data Team • 05/10/2026
The vulnerability identified as CVE-2014-2713 represents a critical denial of service weakness affecting Juniper Junos operating systems across multiple version ranges on high-end MX Series and T4000 routers. This flaw specifically targets the Packet Forwarding Engine modules that operate within the Trio and Cassis architectures, creating a significant operational risk for network infrastructure. The vulnerability stems from insufficient input validation mechanisms within the IP packet processing pipeline of these network devices, allowing malicious actors to exploit the system through carefully crafted IP packets that trigger unexpected behavior in the forwarding engine.
The technical implementation of this vulnerability involves the exploitation of a buffer handling or packet parsing flaw within the PFE modules that process incoming IP traffic. When the affected routers receive specially crafted IP packets, the processing logic fails to properly handle the malformed data structures, leading to a cascade of system failures that ultimately result in the restart of the Packet Forwarding Engine. This restart process effectively disrupts network services by temporarily removing the router's ability to forward packets, creating a denial of service condition that can persist until manual intervention or automatic recovery occurs. The vulnerability affects multiple product lines including MX Series routers and T4000 devices, indicating a widespread impact across Juniper's high-end networking portfolio.
From an operational perspective, this vulnerability presents a severe risk to network availability and reliability, particularly in mission-critical environments where continuous network operation is essential. The remote exploitation capability means that attackers can trigger the denial of service condition from external network positions without requiring physical access or authentication credentials, making the vulnerability particularly dangerous in exposed network infrastructure. The PFE restart operation creates immediate disruption to network traffic flow, potentially causing cascading failures in larger network topologies where these routers serve as critical forwarding points. Organizations relying on these devices for core network services face significant operational challenges when such vulnerabilities are exploited, as the restart process typically results in temporary loss of network connectivity for affected segments.
The impact of this vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and relates to ATT&CK technique T1499.004 for network denial of service attacks. Network administrators must implement immediate mitigation strategies including applying the relevant Juniper security patches and updates released to address the vulnerability. The recommended approach involves upgrading to the patched versions of Junos software, specifically targeting the version ranges mentioned in the vulnerability description where the fixes are available. Network segmentation and access control measures should be enhanced to limit exposure of affected devices to untrusted networks, while monitoring systems should be configured to detect anomalous packet patterns that might indicate exploitation attempts. Additionally, organizations should consider implementing network intrusion detection systems that can identify and alert on suspicious traffic patterns consistent with the vulnerability's exploitation methods.