CVE-2025-30658: Junos OS: SRX Series: On devices with Anti-Virus enabled, malicious server responses will cause memory to leak ultimately causing forwarding to stop
A Missing Release of Memory after Effective Lifetime vulnerability in the Anti-Virus processing of Juniper Networks Junos OS on SRX Series
allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
On all SRX platforms with Anti-Virus enabled, if a server sends specific content in the HTTP body of a response to a client request, these packets are queued by Anti-Virus processing in Juniper Buffers (jbufs) which are never released. When these jbufs are exhausted, the device stops forwarding all transit traffic.
A jbuf memory leak can be noticed from the following logs:
(<node>.)<fpc> Warning: jbuf pool id <#> utilization level (<current level>%) is above <threshold>%!
To recover from this issue, the affected device needs to be manually rebooted to free the leaked jbufs.
This issue affects Junos OS on SRX Series:
all versions before 21.2R3-S9, 21.4 versions before 21.4R3-S10, 22.2 versions before 22.2R3-S6, 22.4 versions before 22.4R3-S6, 23.2 versions before 23.2R2-S3, 23.4 versions before 23.4R2-S3, 24.2 versions before 24.2R2.
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2025-30658?
CVE-2025-30658 is classified as a high severity Denial-of-Service vulnerability.
How do I fix CVE-2025-30658?
To mitigate CVE-2025-30658, update Junos OS to the recommended versions provided by Juniper Networks.
Which systems are affected by CVE-2025-30658?
CVE-2025-30658 affects SRX Series devices running Junos OS with Anti-Virus enabled.
Can CVE-2025-30658 be exploited remotely?
Yes, CVE-2025-30658 allows an unauthenticated, network-based attacker to exploit the vulnerability.
What impact does CVE-2025-30658 have on devices?
CVE-2025-30658 can lead to a Denial-of-Service condition on affected devices.