Vulnerability Database

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Total vulnerabilities in the database

CVE-2024-21598 — juniper / junos

Improper Validation of Syntactic Correctness of Input

An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).

If a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.

This issue affects Juniper Networks Junos OS:

  • 20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;
  • 21.2 versions earlier than 21.2R3-S7;
  • 21.3 versions earlier than 21.3R3-S5;
  • 21.4 versions earlier than 21.4R3-S5;
  • 22.1 versions earlier than 22.1R3-S4;
  • 22.2 versions earlier than 22.2R3-S3;
  • 22.3 versions earlier than 22.3R3-S1;
  • 22.4 versions earlier than 22.4R3;
  • 23.2 versions earlier than 23.2R1-S2, 23.2R2;

Junos OS Evolved:

  • 20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;
  • 21.2-EVO versions earlier than 21.2R3-S7-EVO;
  • 21.3-EVO versions earlier than 21.3R3-S5-EVO;
  • 21.4-EVO versions earlier than 21.4R3-S5-EVO;
  • 22.1-EVO versions earlier than 22.1R3-S4-EVO;
  • 22.2-EVO versions earlier than 22.2R3-S3-EVO;
  • 22.3-EVO versions earlier than 22.3R3-S1-EVO;
  • 22.4-EVO versions earlier than 22.4R3-EVO;
  • 23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;

This issue does not affect Juniper Networks

  • Junos OS versions earlier than 20.4R1;
  • Junos OS Evolved versions earlier than 20.4R1-EVO.

This is a related but separate issue than the one described in JSA79095.

  • Published: Apr 12, 2024
  • Updated: Nov 16, 2025
  • CVE: CVE-2024-21598
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Software From Fixed in
juniper / junos 20.4-r1 20.4-r1.x
juniper / junos 20.4-r1-s1 20.4-r1-s1.x
juniper / junos 20.4-r2 20.4-r2.x
juniper / junos 21.2-r1 21.2-r1.x
juniper / junos 20.4-r2-s1 20.4-r2-s1.x
juniper / junos 21.2-r1-s1 21.2-r1-s1.x
juniper / junos 20.4-r2-s2 20.4-r2-s2.x
juniper / junos 20.4-r3 20.4-r3.x
juniper / junos 20.4-r3-s1 20.4-r3-s1.x
juniper / junos 21.2 21.2.x
juniper / junos 21.2-r1-s2 21.2-r1-s2.x
juniper / junos 21.2-r2 21.2-r2.x
juniper / junos 21.2-r2-s1 21.2-r2-s1.x
juniper / junos 21.2-r2-s2 21.2-r2-s2.x
juniper / junos 21.3-r1 21.3-r1.x
juniper / junos 21.3-r1-s1 21.3-r1-s1.x
juniper / junos 21.3-r2 21.3-r2.x
juniper / junos 21.4-r1-s1 21.4-r1-s1.x
juniper / junos 20.4-r3-s2 20.4-r3-s2.x
juniper / junos 20.4-r3-s3 20.4-r3-s3.x
juniper / junos 20.4-r3-s4 20.4-r3-s4.x
juniper / junos 21.2-r3 21.2-r3.x
juniper / junos 21.3 21.3.x
juniper / junos 21.3-r1-s2 21.3-r1-s2.x
juniper / junos 21.3-r2-s1 21.3-r2-s1.x
juniper / junos 21.3-r2-s2 21.3-r2-s2.x
juniper / junos 21.3-r3 21.3-r3.x
juniper / junos 21.3-r3-s1 21.3-r3-s1.x
juniper / junos 21.4 21.4.x
juniper / junos 21.4-r1 21.4-r1.x
juniper / junos 21.4-r1-s2 21.4-r1-s2.x
juniper / junos 21.4-r2 21.4-r2.x
juniper / junos 21.4-r2-s1 21.4-r2-s1.x
juniper / junos 21.4-r2-s2 21.4-r2-s2.x
juniper / junos 21.4-r3 21.4-r3.x
juniper / junos 22.1-r1 22.1-r1.x
juniper / junos 22.1-r1-s1 22.1-r1-s1.x
juniper / junos 22.1-r1-s2 22.1-r1-s2.x
juniper / junos 22.1-r2 22.1-r2.x
juniper / junos 22.1-r2-s2 22.1-r2-s2.x
juniper / junos 22.2-r1 22.2-r1.x
juniper / junos 22.2-r1-s1 22.2-r1-s1.x
juniper / junos 20.4-r3-s5 20.4-r3-s5.x
juniper / junos 20.4-r3-s6 20.4-r3-s6.x
juniper / junos 20.4-r3-s7 20.4-r3-s7.x
juniper / junos 20.4-r3-s8 20.4-r3-s8.x
juniper / junos 21.2-r3-s1 21.2-r3-s1.x
juniper / junos 21.2-r3-s2 21.2-r3-s2.x
juniper / junos 21.2-r3-s3 21.2-r3-s3.x
juniper / junos 21.2-r3-s4 21.2-r3-s4.x
juniper / junos 21.2-r3-s5 21.2-r3-s5.x
juniper / junos 21.2-r3-s6 21.2-r3-s6.x
juniper / junos 21.3-r3-s2 21.3-r3-s2.x
juniper / junos 21.3-r3-s3 21.3-r3-s3.x
juniper / junos 21.3-r3-s4 21.3-r3-s4.x
juniper / junos 21.4-r3-s1 21.4-r3-s1.x
juniper / junos 21.4-r3-s2 21.4-r3-s2.x
juniper / junos 21.4-r3-s3 21.4-r3-s3.x
juniper / junos 21.4-r3-s4 21.4-r3-s4.x
juniper / junos 22.1 22.1.x
juniper / junos 22.1-r2-s1 22.1-r2-s1.x
juniper / junos 22.1-r3 22.1-r3.x
juniper / junos 22.1-r3-s1 22.1-r3-s1.x
juniper / junos 22.1-r3-s2 22.1-r3-s2.x
juniper / junos 22.1-r3-s3 22.1-r3-s3.x
juniper / junos 22.2 22.2.x
juniper / junos 22.2-r1-s2 22.2-r1-s2.x
juniper / junos 22.2-r2 22.2-r2.x
juniper / junos 22.2-r2-s1 22.2-r2-s1.x
juniper / junos 22.2-r2-s2 22.2-r2-s2.x
juniper / junos 22.2-r3 22.2-r3.x
juniper / junos 22.2-r3-s1 22.2-r3-s1.x
juniper / junos 22.2-r3-s2 22.2-r3-s2.x
juniper / junos 22.3 22.3.x
juniper / junos 22.3-r1 22.3-r1.x
juniper / junos 22.3-r1-s1 22.3-r1-s1.x
juniper / junos 22.3-r1-s2 22.3-r1-s2.x
juniper / junos 22.3-r2 22.3-r2.x
juniper / junos 22.3-r2-s1 22.3-r2-s1.x
juniper / junos 22.3-r2-s2 22.3-r2-s2.x
juniper / junos 22.3-r3 22.3-r3.x
juniper / junos 22.4 22.4.x
juniper / junos 22.4-r1 22.4-r1.x
juniper / junos 22.4-r1-s1 22.4-r1-s1.x
juniper / junos 22.4-r1-s2 22.4-r1-s2.x
juniper / junos 22.4-r2 22.4-r2.x
juniper / junos 22.4-r2-s1 22.4-r2-s1.x
juniper / junos 22.4-r2-s2 22.4-r2-s2.x
juniper / junos 23.2-r1-s1 23.2-r1-s1.x
juniper / junos 23.2-r1 23.2-r1.x
juniper / junos 23.2 23.2.x
juniper / junos_os_evolved 20.4-r1 20.4-r1.x
juniper / junos_os_evolved 21.2-r1 21.2-r1.x
juniper / junos_os_evolved 21.2-r1-s1 21.2-r1-s1.x
juniper / junos_os_evolved 21.2-r2 21.2-r2.x
juniper / junos_os_evolved 20.4-r1-s1 20.4-r1-s1.x
juniper / junos_os_evolved 20.4-r1-s2 20.4-r1-s2.x
juniper / junos_os_evolved 21.3-r1-s1 21.3-r1-s1.x
juniper / junos_os_evolved 21.3-r1 21.3-r1.x
juniper / junos_os_evolved 21.2-r2-s1 21.2-r2-s1.x
juniper / junos_os_evolved 21.2-r1-s2 21.2-r1-s2.x
juniper / junos_os_evolved 21.2 21.2.x
juniper / junos_os_evolved 20.4-r3-s2 20.4-r3-s2.x
juniper / junos_os_evolved 20.4-r3-s1 20.4-r3-s1.x
juniper / junos_os_evolved 20.4-r3 20.4-r3.x
juniper / junos_os_evolved 20.4-r2-s3 20.4-r2-s3.x
juniper / junos_os_evolved 20.4-r2-s2 20.4-r2-s2.x
juniper / junos_os_evolved 20.4-r2-s1 20.4-r2-s1.x
juniper / junos_os_evolved 20.4-r2 20.4-r2.x
juniper / junos_os_evolved 22.3-r1 22.3-r1.x
juniper / junos_os_evolved 22.2-r1-s1 22.2-r1-s1.x
juniper / junos_os_evolved 22.2-r1 22.2-r1.x
juniper / junos_os_evolved 22.1-r1-s2 22.1-r1-s2.x
juniper / junos_os_evolved 22.1-r1-s1 22.1-r1-s1.x
juniper / junos_os_evolved 22.1-r1 22.1-r1.x
juniper / junos_os_evolved 21.4-r2-s2 21.4-r2-s2.x
juniper / junos_os_evolved 21.4-r2-s1 21.4-r2-s1.x
juniper / junos_os_evolved 21.4-r2 21.4-r2.x
juniper / junos_os_evolved 21.4-r1-s2 21.4-r1-s2.x
juniper / junos_os_evolved 21.4-r1-s1 21.4-r1-s1.x
juniper / junos_os_evolved 21.4-r1 21.4-r1.x
juniper / junos_os_evolved 21.4 21.4.x
juniper / junos_os_evolved 21.3-r3 21.3-r3.x
juniper / junos_os_evolved 21.3-r2-s2 21.3-r2-s2.x
juniper / junos_os_evolved 21.3-r2-s1 21.3-r2-s1.x
juniper / junos_os_evolved 21.3-r2 21.3-r2.x
juniper / junos_os_evolved 21.3 21.3.x
juniper / junos_os_evolved 21.2-r3-s1 21.2-r3-s1.x
juniper / junos_os_evolved 21.2-r3 21.2-r3.x
juniper / junos_os_evolved 21.2-r2-s2 21.2-r2-s2.x
juniper / junos_os_evolved 20.4-r3-s5 20.4-r3-s5.x
juniper / junos_os_evolved 20.4-r3-s4 20.4-r3-s4.x
juniper / junos_os_evolved 20.4-r3-s3 20.4-r3-s3.x
juniper / junos_os_evolved 23.2-r1-s1 23.2-r1-s1.x
juniper / junos_os_evolved 23.2-r1 23.2-r1.x
juniper / junos_os_evolved 23.2 23.2.x
juniper / junos_os_evolved 22.4-r2-s2 22.4-r2-s2.x
juniper / junos_os_evolved 22.4-r2-s1 22.4-r2-s1.x
juniper / junos_os_evolved 22.4-r2 22.4-r2.x
juniper / junos_os_evolved 22.4-r1-s2 22.4-r1-s2.x
juniper / junos_os_evolved 22.4-r1-s1 22.4-r1-s1.x
juniper / junos_os_evolved 22.4-r1 22.4-r1.x
juniper / junos_os_evolved 22.4 22.4.x
juniper / junos_os_evolved 22.3-r3 22.3-r3.x
juniper / junos_os_evolved 22.3-r2-s2 22.3-r2-s2.x
juniper / junos_os_evolved 22.3-r2-s1 22.3-r2-s1.x
juniper / junos_os_evolved 22.3-r2 22.3-r2.x
juniper / junos_os_evolved 22.3-r1-s2 22.3-r1-s2.x
juniper / junos_os_evolved 22.3-r1-s1 22.3-r1-s1.x
juniper / junos_os_evolved 22.3 22.3.x
juniper / junos_os_evolved 22.2-r3-s2 22.2-r3-s2.x
juniper / junos_os_evolved 22.2-r3-s1 22.2-r3-s1.x
juniper / junos_os_evolved 22.2-r3 22.2-r3.x
juniper / junos_os_evolved 22.2-r2-s2 22.2-r2-s2.x
juniper / junos_os_evolved 22.2-r2-s1 22.2-r2-s1.x
juniper / junos_os_evolved 22.2-r2 22.2-r2.x
juniper / junos_os_evolved 22.2-r1-s2 22.2-r1-s2.x
juniper / junos_os_evolved 22.2 22.2.x
juniper / junos_os_evolved 22.1-r3-s3 22.1-r3-s3.x
juniper / junos_os_evolved 22.1-r3-s2 22.1-r3-s2.x
juniper / junos_os_evolved 22.1-r3-s1 22.1-r3-s1.x
juniper / junos_os_evolved 22.1-r3 22.1-r3.x
juniper / junos_os_evolved 22.1-r2-s1 22.1-r2-s1.x
juniper / junos_os_evolved 22.1-r2 22.1-r2.x
juniper / junos_os_evolved 22.1 22.1.x
juniper / junos_os_evolved 21.4-r3-s4 21.4-r3-s4.x
juniper / junos_os_evolved 21.4-r3-s3 21.4-r3-s3.x
juniper / junos_os_evolved 21.4-r3-s2 21.4-r3-s2.x
juniper / junos_os_evolved 21.4-r3-s1 21.4-r3-s1.x
juniper / junos_os_evolved 21.4-r3 21.4-r3.x
juniper / junos_os_evolved 21.3-r3-s4 21.3-r3-s4.x
juniper / junos_os_evolved 21.3-r3-s3 21.3-r3-s3.x
juniper / junos_os_evolved 21.3-r3-s2 21.3-r3-s2.x
juniper / junos_os_evolved 21.3-r3-s1 21.3-r3-s1.x
juniper / junos_os_evolved 21.2-r3-s6 21.2-r3-s6.x
juniper / junos_os_evolved 21.2-r3-s5 21.2-r3-s5.x
juniper / junos_os_evolved 21.2-r3-s4 21.2-r3-s4.x
juniper / junos_os_evolved 21.2-r3-s3 21.2-r3-s3.x
juniper / junos_os_evolved 21.2-r3-s2 21.2-r3-s2.x
juniper / junos_os_evolved 20.4-r3-s7 20.4-r3-s7.x
juniper / junos_os_evolved 20.4-r3-s6 20.4-r3-s6.x
juniper / junos_os_evolved 20.4-r3-s8 20.4-r3-s8.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.