Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2023-36850 — juniper / junos

Improper Validation of Specified Index, Position, or Offset in Input

An Improper Validation of Specified Index, Position, or Offset in Input vulnerability in the Connectivity Fault Management(CFM) module of Juniper Networks Junos OS on MX Series(except MPC10, MPC11 and LC9600) allows an adjacent attacker on the local broadcast domain to cause a Denial of Service(DoS).

Upon receiving a malformed CFM packet, the MPC crashes. Continued receipt of these packets causes a sustained denial of service. This issue can only be triggered when CFM hasn't been configured.

This issue affects: Juniper Networks Junos OS All versions prior to 19.1R3-S10 on MX Series; 19.2 versions prior to 19.2R3-S7 on MX Series; 19.3 versions prior to 19.3R3-S8 on MX Series; 19.4 versions prior to 19.4R3-S12 on MX Series; 20.1 version 20.1R1 and later versions on MX Series; 20.2 versions prior to 20.2R3-S7 on MX Series; 20.3 version 20.3R1 and later versions on MX Series; 20.4 versions prior to 20.4R3-S7 on MX Series; 21.1 versions prior to 21.1R3-S5 on MX Series; 21.2 versions prior to 21.2R3-S4 on MX Series; 21.3 versions prior to 21.3R3-S4 on MX Series; 21.4 versions prior to 21.4R3-S3 on MX Series; 22.1 versions prior to 22.1R3-S2 on MX Series; 22.2 versions prior to 22.2R3 on MX Series; 22.3 versions prior to 22.3R2, 22.3R3 on MX Series; 22.4 versions prior to 22.4R2 on MX Series.

  • Published: Jul 14, 2023
  • Updated: Nov 16, 2025
  • CVE: CVE-2023-36850
  • Severity: Medium
  • Exploit:

CVSS v3:

  • Severity: Medium
  • Score: 6.5
  • AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Software From Fixed in
juniper / junos 19.1-r1-s1 19.1-r1-s1.x
juniper / junos 19.1-r1-s3 19.1-r1-s3.x
juniper / junos 19.1-r1-s2 19.1-r1-s2.x
juniper / junos 19.1-r1 19.1-r1.x
juniper / junos 19.1 19.1.x
juniper / junos 19.1-r2 19.1-r2.x
juniper / junos 19.1-r1-s4 19.1-r1-s4.x
juniper / junos 19.1-r2-s1 19.1-r2-s1.x
juniper / junos 19.1-r3 19.1-r3.x
juniper / junos 19.1-r3-s1 19.1-r3-s1.x
juniper / junos 19.1-r3-s2 19.1-r3-s2.x
juniper / junos 19.1-r3-s3 19.1-r3-s3.x
juniper / junos 19.1-r1-s5 19.1-r1-s5.x
juniper / junos 19.1-r3-s4 19.1-r3-s4.x
juniper / junos 19.1-r2-s2 19.1-r2-s2.x
juniper / junos 19.1-r1-s6 19.1-r1-s6.x
juniper / junos 19.1-r3-s5 19.1-r3-s5.x
juniper / junos 19.1-r3-s6 19.1-r3-s6.x
juniper / junos 19.1-r3-s7 19.1-r3-s7.x
juniper / junos 19.1-r2-s3 19.1-r2-s3.x
juniper / junos 19.1-r3-s8 19.1-r3-s8.x
juniper / junos 19.1-r3-s9 19.1-r3-s9.x
juniper / junos 19.2-r3-s6 19.2-r3-s6.x
juniper / junos 19.2-r1-s9 19.2-r1-s9.x
juniper / junos 19.2-r3-s5 19.2-r3-s5.x
juniper / junos 19.2-r1-s8 19.2-r1-s8.x
juniper / junos 19.2-r1-s7 19.2-r1-s7.x
juniper / junos 19.2-r3-s4 19.2-r3-s4.x
juniper / junos 19.2-r3-s2 19.2-r3-s2.x
juniper / junos 19.2-r3-s3 19.2-r3-s3.x
juniper / junos 19.2-r1-s6 19.2-r1-s6.x
juniper / junos 19.2-r3-s1 19.2-r3-s1.x
juniper / junos 19.2-r2-s1 19.2-r2-s1.x
juniper / junos 19.2-r1-s5 19.2-r1-s5.x
juniper / junos 19.2-r2 19.2-r2.x
juniper / junos 19.2-r3 19.2-r3.x
juniper / junos 19.2-r1-s4 19.2-r1-s4.x
juniper / junos 19.2-r1 19.2-r1.x
juniper / junos 19.2 19.2.x
juniper / junos 19.2-r1-s3 19.2-r1-s3.x
juniper / junos 19.2-r1-s1 19.2-r1-s1.x
juniper / junos 19.2-r1-s2 19.2-r1-s2.x
juniper / junos 19.3 19.3.x
juniper / junos 19.3-r1 19.3-r1.x
juniper / junos 19.3-r2-s1 19.3-r2-s1.x
juniper / junos 19.3-r1-s1 19.3-r1-s1.x
juniper / junos 19.3-r2-s5 19.3-r2-s5.x
juniper / junos 19.3-r3 19.3-r3.x
juniper / junos 19.3-r2-s4 19.3-r2-s4.x
juniper / junos 19.3-r2 19.3-r2.x
juniper / junos 19.3-r2-s2 19.3-r2-s2.x
juniper / junos 19.3-r2-s3 19.3-r2-s3.x
juniper / junos 19.3-r3-s1 19.3-r3-s1.x
juniper / junos 19.3-r3-s2 19.3-r3-s2.x
juniper / junos 19.3-r3-s3 19.3-r3-s3.x
juniper / junos 19.3-r3-s4 19.3-r3-s4.x
juniper / junos 19.3-r2-s6 19.3-r2-s6.x
juniper / junos 19.3-r3-s5 19.3-r3-s5.x
juniper / junos 19.3-r3-s7 19.3-r3-s7.x
juniper / junos 19.3-r3-s6 19.3-r3-s6.x
juniper / junos 19.3-r2-s7 19.3-r2-s7.x
juniper / junos 19.4-r3-s10 19.4-r3-s10.x
juniper / junos 19.4-r3-s9 19.4-r3-s9.x
juniper / junos 19.4-r2-s7 19.4-r2-s7.x
juniper / junos 19.4-r3-s8 19.4-r3-s8.x
juniper / junos 19.4-r3-s11 19.4-r3-s11.x
juniper / junos 19.4-r2-s6 19.4-r2-s6.x
juniper / junos 19.4-r3-s7 19.4-r3-s7.x
juniper / junos 19.4 19.4.x
juniper / junos 19.4-r3-s6 19.4-r3-s6.x
juniper / junos 19.4-r2-s5 19.4-r2-s5.x
juniper / junos 19.4-r2-s4 19.4-r2-s4.x
juniper / junos 19.4-r3-s5 19.4-r3-s5.x
juniper / junos 19.4-r1-s4 19.4-r1-s4.x
juniper / junos 19.4-r3-s2 19.4-r3-s2.x
juniper / junos 19.4-r3-s3 19.4-r3-s3.x
juniper / junos 19.4-r3-s4 19.4-r3-s4.x
juniper / junos 19.4-r2-s2 19.4-r2-s2.x
juniper / junos 19.4-r3-s1 19.4-r3-s1.x
juniper / junos 19.4-r2-s3 19.4-r2-s3.x
juniper / junos 19.4-r1-s3 19.4-r1-s3.x
juniper / junos 19.4-r2 19.4-r2.x
juniper / junos 19.4-r2-s1 19.4-r2-s1.x
juniper / junos 19.4-r1-s1 19.4-r1-s1.x
juniper / junos 19.4-r3 19.4-r3.x
juniper / junos 19.4-r1-s2 19.4-r1-s2.x
juniper / junos 19.4-r1 19.4-r1.x
juniper / junos 20.1-r1-s1 20.1-r1-s1.x
juniper / junos 20.1-r1 20.1-r1.x
juniper / junos 20.1-r1-s2 20.1-r1-s2.x
juniper / junos 20.1-r1-s3 20.1-r1-s3.x
juniper / junos 20.1-r1-s4 20.1-r1-s4.x
juniper / junos 20.1-r3 20.1-r3.x
juniper / junos 20.1-r2 20.1-r2.x
juniper / junos 20.1-r2-s1 20.1-r2-s1.x
juniper / junos 20.1-r2-s2 20.1-r2-s2.x
juniper / junos 20.1-r3-s1 20.1-r3-s1.x
juniper / junos 20.1-r3-s2 20.1-r3-s2.x
juniper / junos 20.1-r3-s3 20.1-r3-s3.x
juniper / junos 20.1 20.1.x
juniper / junos 20.1-r3-s4 20.1-r3-s4.x
juniper / junos 20.1-r3-s5 20.1-r3-s5.x
juniper / junos 20.2-r3-s5 20.2-r3-s5.x
juniper / junos 20.2-r3-s6 20.2-r3-s6.x
juniper / junos 20.2-r3-s4 20.2-r3-s4.x
juniper / junos 20.2 20.2.x
juniper / junos 20.2-r3-s3 20.2-r3-s3.x
juniper / junos 20.2-r3-s2 20.2-r3-s2.x
juniper / junos 20.2-r2-s2 20.2-r2-s2.x
juniper / junos 20.2-r2-s3 20.2-r2-s3.x
juniper / junos 20.2-r3 20.2-r3.x
juniper / junos 20.2-r3-s1 20.2-r3-s1.x
juniper / junos 20.2-r1-s3 20.2-r1-s3.x
juniper / junos 20.2-r2 20.2-r2.x
juniper / junos 20.2-r2-s1 20.2-r2-s1.x
juniper / junos 20.2-r1-s1 20.2-r1-s1.x
juniper / junos 20.2-r1-s2 20.2-r1-s2.x
juniper / junos 20.2-r1 20.2-r1.x
juniper / junos 20.3-r1-s1 20.3-r1-s1.x
juniper / junos 20.3-r1 20.3-r1.x
juniper / junos 20.3-r2-s1 20.3-r2-s1.x
juniper / junos 20.3-r2 20.3-r2.x
juniper / junos 20.3-r3 20.3-r3.x
juniper / junos 20.3-r3-s1 20.3-r3-s1.x
juniper / junos 20.3-r1-s2 20.3-r1-s2.x
juniper / junos 20.3-r3-s3 20.3-r3-s3.x
juniper / junos 20.3 20.3.x
juniper / junos 20.3-r3-s2 20.3-r3-s2.x
juniper / junos 20.3-r3-s6 20.3-r3-s6.x
juniper / junos 20.3-r3-s4 20.3-r3-s4.x
juniper / junos 20.3-r3-s5 20.3-r3-s5.x
juniper / junos 20.4-r3-s4 20.4-r3-s4.x
juniper / junos 20.4-r3-s6 20.4-r3-s6.x
juniper / junos 20.4-r3-s5 20.4-r3-s5.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 20.4-r3-s1 20.4-r3-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-r2-s1 20.4-r2-s1.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-r1 20.4-r1.x
juniper / junos 21.1-r1 21.1-r1.x
juniper / junos 21.1-r1-s1 21.1-r1-s1.x
juniper / junos 21.1-r2 21.1-r2.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-r3-s1 21.1-r3-s1.x
juniper / junos 21.1 21.1.x
juniper / junos 21.1-r2-s2 21.1-r2-s2.x
juniper / junos 21.1-r3-s3 21.1-r3-s3.x
juniper / junos 21.1-r3-s2 21.1-r3-s2.x
juniper / junos 21.1-r3-s4 21.1-r3-s4.x
juniper / junos 21.2-r3-s3 21.2-r3-s3.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-r1-s2 21.2-r1-s2.x
juniper / junos 21.2-r2-s1 21.2-r2-s1.x
juniper / junos 21.2-r2 21.2-r2.x
juniper / junos 21.2-r2-s2 21.2-r2-s2.x
juniper / junos 21.2-r3 21.2-r3.x
juniper / junos 21.2 21.2.x
juniper / junos 21.2-r1-s1 21.2-r1-s1.x
juniper / junos 21.2-r1 21.2-r1.x
juniper / junos 21.3-r1 21.3-r1.x
juniper / junos 21.3-r2 21.3-r2.x
juniper / junos 21.3 21.3.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-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-s3 21.3-r3-s3.x
juniper / junos 21.3-r3-s2 21.3-r3-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 21.4-r3.x
juniper / junos 21.4-r2-s2 21.4-r2-s2.x
juniper / junos 21.4-r1-s2 21.4-r1-s2.x
juniper / junos 21.4-r1 21.4-r1.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 21.4.x
juniper / junos 22.1-r1 22.1-r1.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-r3 22.1-r3.x
juniper / junos 22.1-r3-s1 22.1-r3-s1.x
juniper / junos 22.1-r2-s1 22.1-r2-s1.x
juniper / junos 22.2-r2-s2 22.2-r2-s2.x
juniper / junos 22.2-r2-s1 22.2-r2-s1.x
juniper / junos 22.2-r1-s2 22.2-r1-s2.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 22.3-r1 22.3-r1.x
juniper / junos 22.3-r1-s2 22.3-r1-s2.x
juniper / junos 22.3-r1-s1 22.3-r1-s1.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

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.