Vulnerability in Juniper Junos OS Evolved
CVE-2025-21599
A Missing Release of Memory after Effective Lifetime vulnerability in the Juniper Tunnel Driver (jtd) of Juniper Networks Junos OS Evolved allows an unauthenticated network-based attacker to cause Denial of Service. Receipt of specifically malformed IPv6 packets, destined to the device, causes kernel memory to not be freed, resulting in memory exhaustion leading to a system crash and Denial of Service (DoS). Continuous receipt and processing of these packets will continue to exhaust kernel memory, creating a sustained Denial of Service (DoS) condition. This issue only affects systems configured with IPv6. This issue affects Junos OS Evolved: * from 22.4-EVO before 22.4R3-S5-EVO, * from 23.2-EVO before 23.2R2-S2-EVO, * from 23.4-EVO before 23.4R2-S2-EVO, * from 24.2-EVO before 24.2R1-S2-EVO, 24.2R2-EVO. This issue does not affect Juniper Networks Junos OS Evolved versions prior to 22.4R1-EVO.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Juniper Junos OS Evolved — versions 22.4, 23.2, 23.4
- Juniper Networks Junos OS Evolved — versions 22.4-EVO, 23.2-EVO, 23.4-EVO
Weakness classification (CWE)
References
- supportportal.juniper.net/JSA92869 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-21599?
- CVE-2025-21599 is a high-severity vulnerability in Juniper Junos OS Evolved, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2025-01-09.
- How severe is CVE-2025-21599?
- High severity. CVSS v3 base score is 7.5 out of 10.