Junos OS (SRX firewalls)
CVE-2025-30651: Receipt of a specific ICMPv6 packet causes a memory overrun leading to an rpd crash
A Buffer Access with Incorrect Length Value vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS 0 | 21.2R3-S9 or later |
| Junos OS 21.4 | 21.4R3-S10 or later |
| Junos OS 22.2 | 22.2R3-S6 or later |
| Junos OS 22.4 | 22.4R3-S4 or later |
| Junos OS 23.2 | 23.2R2-S2 or later |
| Junos OS 23.4 | 23.4R2 or later |
| Junos OS Evolved 0 | 21.2R3-S9-EVO or later |
| Junos OS Evolved 21.4-EVO | 21.4R3-S10-EVO or later |
| Junos OS Evolved 22.2-EVO | 22.2R3-S6-EVO or later |
| Junos OS Evolved 22.4-EVO | 22.4R3-S4-EVO or later |
| Junos OS Evolved 23.2-EVO | 23.2R2-S2-EVO or later |
| Junos OS Evolved 23.4-EVO | 23.4R2-EVO or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A Buffer Access with Incorrect Length Value vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). When an attacker sends a specific ICMPv6 packet to an interface with "protocols router-advertisement" configured, rpd crashes and restarts. Continued receipt of this packet will cause a sustained DoS condition.
This issue only affects systems configured with IPv6.
This issue affects Junos OS:
- All versions before 21.2R3-S9,
- from 21.4 before 21.4R3-S10,
- from 22.2 before 22.2R3-S6,
- from 22.4 before 22.4R3-S4,
- from 23.2 before 23.2R2-S2,
- from 23.4 before 23.4R2;
and Junos OS Evolved: * All versions before 21.2R3-S9-EVO, * from 21.4-EVO before 21.4R3-S10-EVO, * from 22.2-EVO before 22.2R3-S6-EVO, * from 22.4-EVO before 22.4R3-S4-EVO, * from 23.2-EVO before 23.2R2-S2-EVO, * from 23.4-EVO before 23.4R2-EVO.
Am I affected?
The following configuration is required to be affected by this issue:
[ protocols router-advertisement interface <interface-name> ] [ interfaces <interface-name> unit <unit> family inet6 address <ipv6-addr> ]
Workarounds
There are no known workarounds for this issue.
A firewall filter can be implemented to restrict ICMPv6 traffic.
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.