Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2024-21607 — juniper / junos

Unimplemented or Unsupported Feature in UI

An Unsupported Feature in the UI vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series allows an unauthenticated, network-based attacker to cause partial impact to the integrity of the device.

If the "tcp-reset" option is added to the "reject" action in an IPv6 filter which matches on "payload-protocol", packets are permitted instead of rejected. This happens because the payload-protocol match criteria is not supported in the kernel filter causing it to accept all packets without taking any other action. As a fix the payload-protocol match will be treated the same as a "next-header" match to avoid this filter bypass.

This issue doesn't affect IPv4 firewall filters.

This issue affects Juniper Networks Junos OS on MX Series and EX9200 Series:

  • All versions earlier than 20.4R3-S7;
  • 21.1 versions earlier than 21.1R3-S5;
  • 21.2 versions earlier than 21.2R3-S5;
  • 21.3 versions earlier than 21.3R3-S4;
  • 21.4 versions earlier than 21.4R3-S4;
  • 22.1 versions earlier than 22.1R3-S2;
  • 22.2 versions earlier than 22.2R3-S2;
  • 22.3 versions earlier than 22.3R2-S2, 22.3R3;
  • 22.4 versions earlier than 22.4R1-S2, 22.4R2-S2, 22.4R3.
  • Published: Jan 12, 2024
  • Updated: Nov 16, 2025
  • CVE: CVE-2024-21607
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 5.3
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWEs:

Software From Fixed in
juniper / junos - 20.4
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-s4 20.4-r3-s4.x
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 20.4-r2-s1 20.4-r2-s1.x
juniper / junos 20.4-r3 20.4-r3.x
juniper / junos 20.4-r3-s1 20.4-r3-s1.x
juniper / junos 20.4-r2-s2 20.4-r2-s2.x
juniper / junos 20.4 20.4.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 21.1-r3-s1 21.1-r3-s1.x
juniper / junos 21.1-r2 21.1-r2.x
juniper / junos 21.1-r2-s2 21.1-r2-s2.x
juniper / junos 21.1-r3 21.1-r3.x
juniper / junos 21.1-r2-s1 21.1-r2-s1.x
juniper / junos 21.1-r1-s1 21.1-r1-s1.x
juniper / junos 21.1-r1 21.1-r1.x
juniper / junos 21.1-r3-s3 21.1-r3-s3.x
juniper / junos 21.1-r3-s4 21.1-r3-s4.x
juniper / junos 21.1 21.1.x
juniper / junos 21.1-r3-s2 21.1-r3-s2.x
juniper / junos 21.2-r3-s2 21.2-r3-s2.x
juniper / junos 21.2-r3-s1 21.2-r3-s1.x
juniper / junos 21.2-r3-s4 21.2-r3-s4.x
juniper / junos 21.2-r3-s3 21.2-r3-s3.x
juniper / junos 21.2-r1 21.2-r1.x
juniper / junos 21.2-r1-s1 21.2-r1-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-s1 21.2-r2-s1.x
juniper / junos 21.2-r2-s2 21.2-r2-s2.x
juniper / junos 21.2-r2 21.2-r2.x
juniper / junos 21.2-r3 21.2-r3.x
juniper / junos 21.3-r1-s1 21.3-r1-s1.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 21.3-r1 21.3-r1.x
juniper / junos 21.3-r2 21.3-r2.x
juniper / junos 21.3-r3-s3 21.3-r3-s3.x
juniper / junos 21.3-r3-s2 21.3-r3-s2.x
juniper / junos 21.3 21.3.x
juniper / junos 21.4-r3 21.4-r3.x
juniper / junos 21.4-r2-s2 21.4-r2-s2.x
juniper / junos 21.4-r3-s2 21.4-r3-s2.x
juniper / junos 21.4-r3-s1 21.4-r3-s1.x
juniper / junos 21.4-r3-s3 21.4-r3-s3.x
juniper / junos 21.4-r1-s1 21.4-r1-s1.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-r1-s2 21.4-r1-s2.x
juniper / junos 21.4 21.4.x
juniper / junos 21.4-r1 21.4-r1.x
juniper / junos 22.1-r1 22.1-r1.x
juniper / junos 22.1-r3-s1 22.1-r3-s1.x
juniper / junos 22.1-r3 22.1-r3.x
juniper / junos 22.1-r1-s2 22.1-r1-s2.x
juniper / junos 22.1-r2-s2 22.1-r2-s2.x
juniper / junos 22.1-r1-s1 22.1-r1-s1.x
juniper / junos 22.1-r2 22.1-r2.x
juniper / junos 22.1 22.1.x
juniper / junos 22.1-r2-s1 22.1-r2-s1.x
juniper / junos 22.2-r3-s1 22.2-r3-s1.x
juniper / junos 22.2 22.2.x
juniper / junos 22.2-r1 22.2-r1.x
juniper / junos 22.2-r1-s1 22.2-r1-s1.x
juniper / junos 22.2-r2 22.2-r2.x
juniper / junos 22.2-r1-s2 22.2-r1-s2.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 22.3-r1-s2 22.3-r1-s2.x
juniper / junos 22.3-r2-s1 22.3-r2-s1.x
juniper / junos 22.3-r1-s1 22.3-r1-s1.x
juniper / junos 22.3-r2 22.3-r2.x
juniper / junos 22.3-r1 22.3-r1.x
juniper / junos 22.3 22.3.x
juniper / junos 22.4-r2-s1 22.4-r2-s1.x
juniper / junos 22.4 22.4.x
juniper / junos 22.4-r1 22.4-r1.x
juniper / junos 22.4-r2 22.4-r2.x
juniper / junos 22.4-r1-s1 22.4-r1-s1.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.