#VU107433 Missing release of memory after effective lifetime in Junos OS Evolved and Juniper Junos OS - CVE-2025-21595

Vulnerability identifier: #VU107433

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-21595

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Junos OS Evolved
Operating systems & Components / Operating system
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to missing release of memory after effective lifetime error in the Packet Forwarding Engine (PFE). A remote non-authenticated attacker can cause an FPC to crash, leading to Denial of Service (DoS).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: before 21.2R3-S7-EVO, 21.4R3-S4-EVO, 22.2R3-S1-EVO, 22.3R3-S1-EVO, 22.4R3-EVO, 23.2R1-EVO, 21.2R3-S7-EVO, 21.2R3-S7-EVO, 21.2R3-S7-EVO, 21.2R3-S7-EVO, 21.2R3-S7-EVO, 21.2R3-S7-EVO

Juniper Junos OS: before 21.2R3-S7, 21.4R3-S4, 22.2R3-S1, 22.3R3-S1, 22.4R2-S2, 22.4R3, 23.2R1, 21.2R3-S7, 21.2R3-S7, 21.2R3-S7, 21.2R3-S7, 21.2R3-S7, 21.2R3-S7

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External links
https://supportportal.juniper.net/s/article/2025-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-In-an-EVPN-VXLAN-scenario-specific-ARP-or-NDP-packets-cause-FPC-to-crash-CVE-2025-21595

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.