Vulnerability Database

346,508

Total vulnerabilities in the database

CVE-2025-59969 — juniper / junos_os_evolved

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

A Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the advanced forwarding toolkit (evo-aftmand/evo-pfemand) of Juniper Networks Junos OS Evolved on PTX Series or QFX5000 Series allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).An attacker sending crafted multicast packets will cause line cards running evo-aftmand/evo-pfemand to crash and restart or non-line card devices to crash and restart. Continued receipt and processing of these packets will sustain the Denial of Service (DoS) condition.

This issue affects Junos OS Evolved PTX Series:

  • All versions before 22.4R3-S8-EVO,
  • from 23.2 before 23.2R2-S5-EVO,
  • from 23.4 before 23.4R2-EVO,
  • from 24.2 before 24.2R2-EVO,
  • from 24.4 before 24.4R2-EVO.

This issue affects Junos OS Evolved on QFX5000 Series:

  • 22.2-EVO version before 22.2R3-S7-EVO,
  • 22.4-EVO version before 22.4R3-S7-EVO,
  • 23.2-EVO versions before 23.2R2-S4-EVO,
  • 23.4-EVO versions before 23.4R2-S5-EVO,
  • 24.2-EVO versions before 24.2R2-S1-EVO,
  • 24.4-EVO versions before 24.4R1-S3-EVO, 24.4R2-EVO.

This issue does not affect Junos OS Evolved on QFX5000 Series versions before: 21.2R2-S1-EVO, 21.2R3-EVO, 21.3R2-EVO, 21.4R1-EVO, and 22.1R1-EVO.

  • Published: Apr 9, 2026
  • Updated: Apr 10, 2026
  • CVE: CVE-2025-59969
  • 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

CWEs:

Software From Fixed in
juniper / junos_os_evolved - 22.4
juniper / junos_os_evolved 22.4 22.4.x
juniper / junos_os_evolved 22.4-r1 22.4-r1.x
juniper / junos_os_evolved 22.4-r1-s1 22.4-r1-s1.x
juniper / junos_os_evolved 22.4-r1-s2 22.4-r1-s2.x
juniper / junos_os_evolved 22.4-r2 22.4-r2.x
juniper / junos_os_evolved 22.4-r2-s1 22.4-r2-s1.x
juniper / junos_os_evolved 22.4-r2-s2 22.4-r2-s2.x
juniper / junos_os_evolved 22.4-r3 22.4-r3.x
juniper / junos_os_evolved 22.4-r3-s1 22.4-r3-s1.x
juniper / junos_os_evolved 22.4-r3-s2 22.4-r3-s2.x
juniper / junos_os_evolved 22.4-r3-s3 22.4-r3-s3.x
juniper / junos_os_evolved 22.4-r3-s4 22.4-r3-s4.x
juniper / junos_os_evolved 22.4-r3-s5 22.4-r3-s5.x
juniper / junos_os_evolved 22.4-r3-s6 22.4-r3-s6.x
juniper / junos_os_evolved 22.4-r3-s7 22.4-r3-s7.x
juniper / junos_os_evolved 23.2 23.2.x
juniper / junos_os_evolved 23.2-r1 23.2-r1.x
juniper / junos_os_evolved 23.2-r1-s1 23.2-r1-s1.x
juniper / junos_os_evolved 23.2-r1-s2 23.2-r1-s2.x
juniper / junos_os_evolved 23.2-r2 23.2-r2.x
juniper / junos_os_evolved 23.2-r2-s1 23.2-r2-s1.x
juniper / junos_os_evolved 23.2-r2-s2 23.2-r2-s2.x
juniper / junos_os_evolved 23.2-r2-s3 23.2-r2-s3.x
juniper / junos_os_evolved 23.2-r2-s4 23.2-r2-s4.x
juniper / junos_os_evolved 23.4 23.4.x
juniper / junos_os_evolved 23.4-r1 23.4-r1.x
juniper / junos_os_evolved 23.4-r1-s1 23.4-r1-s1.x
juniper / junos_os_evolved 23.4-r1-s2 23.4-r1-s2.x
juniper / junos_os_evolved 24.2 24.2.x
juniper / junos_os_evolved 24.2-r1 24.2-r1.x
juniper / junos_os_evolved 24.2-r1-s2 24.2-r1-s2.x
juniper / junos_os_evolved 24.4 24.4.x
juniper / junos_os_evolved 24.4-r1 24.4-r1.x
juniper / junos_os_evolved 24.4-r1-s2 24.4-r1-s2.x
juniper / junos_os_evolved 24.4-r1-s3 24.4-r1-s3.x
juniper / junos_os_evolved 22.2 22.2.x
juniper / junos_os_evolved 22.2-r1 22.2-r1.x
juniper / junos_os_evolved 22.2-r1-s1 22.2-r1-s1.x
juniper / junos_os_evolved 22.2-r1-s2 22.2-r1-s2.x
juniper / junos_os_evolved 22.2-r2 22.2-r2.x
juniper / junos_os_evolved 22.2-r2-s1 22.2-r2-s1.x
juniper / junos_os_evolved 22.2-r2-s2 22.2-r2-s2.x
juniper / junos_os_evolved 22.2-r3 22.2-r3.x
juniper / junos_os_evolved 22.2-r3-s1 22.2-r3-s1.x
juniper / junos_os_evolved 22.2-r3-s2 22.2-r3-s2.x
juniper / junos_os_evolved 22.2-r3-s3 22.2-r3-s3.x
juniper / junos_os_evolved 22.2-r3-s4 22.2-r3-s4.x
juniper / junos_os_evolved 22.2-r3-s5 22.2-r3-s5.x
juniper / junos_os_evolved 22.2-r3-s6 22.2-r3-s6.x
juniper / junos_os_evolved 23.4-r2 23.4-r2.x
juniper / junos_os_evolved 23.4-r2-s1 23.4-r2-s1.x
juniper / junos_os_evolved 23.4-r2-s2 23.4-r2-s2.x
juniper / junos_os_evolved 23.4-r2-s3 23.4-r2-s3.x
juniper / junos_os_evolved 23.4-r2-s4 23.4-r2-s4.x
juniper / junos_os_evolved 24.2-r2 24.2-r2.x
juniper / junos_os_evolved 24.4-r2 24.4-r2.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.