CVE-2025-59969
Received Received - Intake
Buffer Overflow in Junos OS Evolved Forwarding Causes DoS

Publication date: 2026-04-09

Last updated on: 2026-04-28

Assigner: Juniper Networks, Inc.

Description
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.
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Meta Information
Published
2026-04-09
Last Modified
2026-04-28
Generated
2026-05-07
AI Q&A
2026-04-10
EPSS Evaluated
2026-05-05
NVD
CVE-2025-59969
EUVD
EUVD-2025-209396
Affected Vendors & Products
Showing 57 associated CPEs
Vendor Product Version / Range
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 22.4
juniper junos_os_evolved 24.2
juniper junos_os_evolved 24.2
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.2
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved to 22.4 (exc)
juniper junos_os_evolved 23.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 22.4
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 24.2
juniper junos_os_evolved 24.4
juniper junos_os_evolved 24.4
juniper junos_os_evolved 24.4
juniper junos_os_evolved 24.4
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
juniper junos_os_evolved 23.4
juniper junos_os_evolved 22.2
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 24.2
juniper junos_os_evolved 24.4
juniper junos_os_evolved 22.2
juniper junos_os_evolved 22.2
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

The provided information does not specify how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.


Can you explain this vulnerability to me?

This vulnerability is a classic buffer overflow issue in the advanced forwarding toolkit (evo-aftmand/evo-pfemand) of Juniper Networks Junos OS Evolved running on PTX Series or QFX5000 Series devices.

An unauthenticated attacker who is adjacent to the network can send specially crafted multicast packets that cause the affected line cards or devices to crash and restart.

Because the system continues to receive and process these malicious packets, the Denial of Service (DoS) condition can be sustained.


How can this vulnerability impact me? :

The primary impact of this vulnerability is a Denial of Service (DoS) condition.

An attacker can cause affected devices or line cards to crash and restart repeatedly by sending crafted multicast packets.

This can disrupt network operations and availability, potentially causing significant service interruptions.


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