CVE-2025-59969: CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Juniper Networks Junos OS Evolved
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2025-59969) involves a classic buffer overflow (CWE-120) in the evo-aftmand/evo-pfemand components of Juniper Networks Junos OS Evolved on PTX and QFX5000 Series devices. It allows an unauthenticated attacker on an adjacent network to cause a Denial of Service by sending specially crafted multicast packets that trigger crashes and restarts of line cards or devices processing these packets. The issue affects multiple versions before specific fixed releases listed for each series. The CVSS 3.1 score is 6.5 (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating no confidentiality or integrity impact but a high impact on availability. Juniper manages remediation for this cloud-hosted service, and patches are available in the fixed versions.
Potential Impact
Successful exploitation results in a Denial of Service condition by crashing and restarting affected line cards or devices running the vulnerable components. There is no impact on confidentiality or integrity. The DoS can be sustained by continued receipt of crafted multicast packets. No known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available from Juniper Networks in the fixed versions of Junos OS Evolved as listed. Since this is a cloud-hosted service, Juniper manages remediation server-side. Users should verify they are running a fixed version at or beyond the specified releases to mitigate this vulnerability. Patch status is confirmed by vendor advisory data.
CVE-2025-59969: CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Juniper Networks Junos OS Evolved
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2025-59969) involves a classic buffer overflow (CWE-120) in the evo-aftmand/evo-pfemand components of Juniper Networks Junos OS Evolved on PTX and QFX5000 Series devices. It allows an unauthenticated attacker on an adjacent network to cause a Denial of Service by sending specially crafted multicast packets that trigger crashes and restarts of line cards or devices processing these packets. The issue affects multiple versions before specific fixed releases listed for each series. The CVSS 3.1 score is 6.5 (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating no confidentiality or integrity impact but a high impact on availability. Juniper manages remediation for this cloud-hosted service, and patches are available in the fixed versions.
Potential Impact
Successful exploitation results in a Denial of Service condition by crashing and restarting affected line cards or devices running the vulnerable components. There is no impact on confidentiality or integrity. The DoS can be sustained by continued receipt of crafted multicast packets. No known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available from Juniper Networks in the fixed versions of Junos OS Evolved as listed. Since this is a cloud-hosted service, Juniper manages remediation server-side. Users should verify they are running a fixed version at or beyond the specified releases to mitigate this vulnerability. Patch status is confirmed by vendor advisory data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2025-09-23T18:19:06.955Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Is Cloud Service
- true
Threat ID: 69d843721cc7ad14da3fb3f4
Added to database: 4/10/2026, 12:25:22 AM
Last enriched: 4/10/2026, 12:52:22 AM
Last updated: 4/10/2026, 8:14:25 AM
Views: 6
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