Buffer Overflow in Junos OS Evolved evo-aftmand (pre 22.4R3-S8-EVO)
CVE-2025-59969 Published on April 9, 2026
Junos OS Evolved: QFX5000 Series and PTX Series: An attacker sending crafted multicast packets will cause evo-aftmand / evo-pfemand to crash and restart
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.
Vulnerability Analysis
Timeline
Initial Publication
Weakness Type
What is a Classic Buffer Overflow Vulnerability?
The program 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, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.
CVE-2025-59969 has been classified to as a Classic Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2025-59969
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Affected Versions
Juniper Networks Junos OS Evolved:- Before 22.4R3-S8-EVO is affected.
- Version 23.2 and below 23.2R2-S5-EVO is affected.
- Version 23.4 and below 23.4R2-EVO is affected.
- Version 24.2 and below 24.2R2-EVO is affected.
- Version 24.4 and below 24.4R2-EVO is affected.
- Version 22.2 and below 22.2R3-S7-EVO is affected.
- Version 22.4 and below 22.4R3-S7-EVO is affected.
- Version 23.2 and below 23.2R2-S4-EVO is affected.
- Version 23.4 and below 23.4R2-S5-EVO is affected.
- Version 24.2 and below 24.2R2-S1-EVO is affected.
- Version 24.4 and below 24.4R1-S3-EVO, 24.4R2-EVO is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.