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Juniper Networks OS Update Released Amid High Severity Flaws

Wajahat Raja

February 15, 2024 - TuxCare expert team

In response to pressing security concerns, Juniper Networks has swiftly deployed out-of-band updates aimed at mitigating two high-severity vulnerabilities. These vulnerabilities, identified as CVE-2024-21619 and CVE-2024-21620, pose significant risks to SRX Series and EX Series systems, potentially granting unauthorized access to threat actors. Juniper OS vulnerability mitigation is crucial for safeguarding systems and maintaining a resilient cybersecurity posture. In this blog, we delve into the critical aspects of the latest Juniper Networks OS update, ensuring you stay informed and protected against potential vulnerabilities.

The Vulnerabilities


The Juniper Networks security vulnerabilities represent significant risks to the security and integrity of SRX Series and EX Series systems. These cyber threats to Juniper devices highlight the critical importance of prompt mitigation measures and proactive security practices.


CVE-2024-21619 (CVSS score: 5.3) – The Missing Authentication for Critical Function vulnerability exposes a critical flaw in the Juniper Networks Junos OS. This vulnerability, when coupled with a Generation of Error Message Containing Sensitive Information issues within J-Web, could allow unauthenticated attackers to glean sensitive system information, compromising system integrity.


CVE-2024-21620 (CVSS score: 8.8) – The Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’) vulnerability in J-Web presents a significant risk. Exploiting this flaw empowers attackers to craft malicious URLs capable of executing commands within the context of the target user, potentially escalating privileges to administrator levels. The flaw lies in a specific invocation within the webauth_operation.php file, enabling attackers to exploit it to their advantage.


Additional Vulnerabilities Addressed


Juniper Networks has also addressed two additional high-severity flaws in Juniper OS:


  • CVE-2023-36846 (CVSS score: 5.3) – Another instance of Missing Authentication for Critical Function vulnerability in Junos OS, allowing unauthenticated network-based attacks to cause limited filesystem integrity impact on SRX Series devices.
  • CVE-2023-36851 (CVSS score: 5.3) – A similar vulnerability affecting both SRX Series and EX Series devices, enabling unauthorized network-based attackers to inflict limited filesystem integrity impact.


The Juniper Networks OS update ensures robust protection against evolving threats and vulnerabilities.


Juniper Networks OS Update – Response and Recommendations

critical vulnerabilities in Juniper Networks were identified and reported by cybersecurity firm Watchtowr. As an immediate response, Juniper Networks advises users to implement the following measures:


  1. Consider applying the provided updates promptly to mitigate the identified vulnerabilities effectively.
  2. As a temporary workaround, consider disabling J-Web access or restricting access to trusted hosts to minimize exposure to potential attacks.
  3. Maintain vigilance and stay informed about emerging security threats and updates from Juniper Networks.


Juniper OS security updates are essential for maintaining system integrity and protecting against emerging threats.



The importance of timely network security updates cannot be overstated, as they are essential for safeguarding against emerging threats and vulnerabilities. Juniper Networks’ proactive approach in swiftly addressing these critical vulnerabilities underscores the company’s commitment to ensuring the security and integrity of its products. The network security patch release addresses critical vulnerabilities and enhances overall system resilience.


By promptly deploying out-of-band updates and providing clear guidance to users, Juniper Networks aims to minimize the risk posed by these vulnerabilities and enhance overall system security. It is imperative for users to remain vigilant, apply the recommended updates as well as recommended cybersecurity practices, and adopt network infrastructure security measures to safeguard against potential threats effectively.

The sources for this piece include articles in
The Hacker News and Security Affairs.

Juniper Networks OS Update Released Amid High Severity Flaws
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Juniper Networks OS Update Released Amid High Severity Flaws
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