Juniper Networks Junos OS Vulnerability Allows DoS or RCE and Root Privileges
CVE-2024-21591

9.8CRITICAL

Key Information:

Vendor: Juniper Networks
Status: Junos Os
Vendor: CVE Published:; 12 January 2024

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What is CVE-2024-21591?

CVE-2024-21591 is a significant vulnerability affecting Juniper Networks' Junos OS, primarily on SRX Series and EX Series devices. This vulnerability allows unauthenticated, network-based attackers to exploit an out-of-bounds write condition, leading to Denial of Service (DoS) and Remote Code Execution (RCE) with root privileges. As Junos OS is a critical operating system for networking devices used by organizations around the world, the exploitation of this vulnerability could result in severe disruptions to network operations and potentially expose sensitive data, jeopardizing overall organizational security.

Technical Details

The vulnerability arises from the use of an insecure function within J-Web, which enables attackers to overwrite arbitrary memory locations. This flaw is present in various versions of Junos OS, specifically those released prior to certain patches that address this issue. The affected versions span multiple releases, including older versions and those in the 20.x to 22.x range. An attacker can leverage this vulnerability without needing specific access privileges, making it particularly dangerous.

Impact of the Vulnerability

Denial of Service (DoS): Attackers can render affected devices inoperable, leading to significant downtime and disruption of network services. This can affect an organization's ability to conduct business and serve its clients effectively.
Remote Code Execution (RCE): The vulnerability allows attackers to execute arbitrary code on the affected devices. This capability can lead to further exploits, including the installation of malware or the creation of backdoor access, posing long-term security risks.
Privilege Escalation: Gaining root privileges on network devices can allow attackers to manipulate configurations, access sensitive network data, or pivot to other internal systems, amplifying the impact and potential damage of the initial exploitation.