Denial of service in Junos OS Evolved jtd



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-21599
CWE-ID CWE-772
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Junos OS Evolved
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Missing Release of Resource after Effective Lifetime

EUVDB-ID: #VU102493

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-2025-21599

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

Exploit availability: No

Description

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

The vulnerability exists due to the Juniper Tunnel Driver (jtd) does not properly release memory when handling IPv6 packets. A remote attacker can send malformed IPv6 packets destined to the device and kernel memory to not be freed, resulting in a denial of service condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 22.4R1-EVO - 24.2R1-S1-EVO

CPE2.3 External links

https://supportportal.juniper.net/s/article/2025-01-Security-Bulletin-Junos-OS-Evolved-Receipt-of-specifically-malformed-IPv6-packets-causes-kernel-memory-exhaustion-leading-to-Denial-of-Service-CVE-2025-21599


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.



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