What is CVE-2025-59969?

CVE-2025-59969 is a medium-severity vulnerability in Juniper Junos_os_evolved, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2026-04-09.

How severe is CVE-2025-59969?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Juniper Junos_os_evolved

CVE-2025-59969

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 unauthentica…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (5.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Juniper Junos_os_evolved — versions 22.4, 23.2, 23.4
Juniper Ptx10001-36mr
Juniper Ptx10002-36qdd
Juniper Ptx10003
Juniper Ptx10004
Juniper Ptx10008
Juniper Ptx10016
Juniper Ptx12008
Juniper Qfx5110
Juniper Qfx5120

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

sirt@juniper.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-59969?: CVE-2025-59969 is a medium-severity vulnerability in Juniper Junos_os_evolved, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2026-04-09.
How severe is CVE-2025-59969?: Medium severity. CVSS v3 base score is 6.5 out of 10.