Junos OS (SRX firewalls)
CVE-2025-21602: Receipt of specially crafted BGP update packet causes RPD crash
An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a specific BGP update packet to cause rpd to crash and restart, resulting in 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 21.4 | 21.4R3-S9 or later |
| Junos OS 22.2 | 22.2R3-S5 or later |
| Junos OS 22.3 | 22.3R3-S4 or later |
| Junos OS 22.4 | 22.4R3-S5 or later |
| Junos OS 23.2 | 23.2R2-S3 or later |
| Junos OS 23.4 | 23.4R2-S3 or later |
| Junos OS 24.2 | 24.2R1-S2, 24.2R2 or later |
| Junos OS 0 | Not affected |
| Junos OS Evolved 21.4 | 21.4R3-S9-EVO or later |
| Junos OS Evolved 22.2 | 22.2R3-S5-EVO or later |
| Junos OS Evolved 22.3 | 22.3R3-S4-EVO or later |
| Junos OS Evolved 22.4 | 22.4R3-S5-EVO or later |
| Junos OS Evolved 23.2 | 23.2R2-S3-EVO or later |
| Junos OS Evolved 23.4 | 23.4R2-S3-EVO or later |
| Junos OS Evolved 24.2 | 24.2R1-S2-EVO, 24.2R2-EVO or later |
| Junos OS Evolved 0 | Not affected |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a specific BGP update packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS).
Continuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.
This issue affects Junos OS:
- from 21.4 before 21.4R3-S9,
- from 22.2 before 22.2R3-S5,
- from 22.3 before 22.3R3-S4,
- from 22.4 before 22.4R3-S5,
- from 23.2 before 23.2R2-S3,
- from 23.4 before 23.4R2-S3,
- from 24.2 before 24.2R1-S2, 24.2R2;
This issue does not affect versions prior to 21.1R1.
Junos OS Evolved:
- from 21.4 before 21.4R3-S9-EVO,
- from 22.2 before 22.2R3-S5-EVO,
- from 22.3 before 22.3R3-S4-EVO,
- from 22.4 before 22.4R3-S5-EVO,
- from 23.2 before 23.2R2-S3-EVO,
- from 23.4 before 23.4R2-S3-EVO,
- from 24.2 before 24.2R1-S2-EVO, 24.2R2-EVO.
This issue does not affect versions prior to 21.1R1-EVO
Workarounds
There are no known workarounds for this issue.
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.