Buffer Overflow Vulnerability in Junos OS Evolved on Juniper Networks Products
CVE-2025-59969

7.1HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os Evolved
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists

What is CVE-2025-59969?

A buffer overflow vulnerability in the advanced forwarding toolkit of Juniper's Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS). By sending crafted multicast packets, an attacker can induce line cards running specific components to crash and restart, impacting overall system stability. The DoS condition can be sustained through continuous, malicious packet transmission, affecting both line cards and non-line card devices. The flaw exists in various versions of the PTX Series and QFX5000 Series, necessitating immediate attention from affected organizations.

Affected Version(s)

Junos OS Evolved PTX Series 0 < 22.4R3-S8-EVO

Junos OS Evolved PTX Series 23.2 < 23.2R2-S5-EVO

Junos OS Evolved PTX Series 23.4 < 23.4R2-EVO

References

https://kb.juniper.net/JSA103159
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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