CVE-2025-30657

What it is

An Improper Encoding or Escaping of Output vulnerability in the Sampling Route Record Daemon (SRRD) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS). When a device configured for flow-monitoring receives a specific BGP update message, it is correctly processed internally by the routing protocol daemon (rpd), but when it's sent to SRRD it's encoded incorrectly which leads to a crash and momentary interruption of jflow processing until it automatically restarts. This issue does not affect traffic forwarding itself. This issue affects Junos OS:  * 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, * 23.2 versions before 23.2R1-S2, 23.2R2. This issue does not affected Junos OS Evolved.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-04-09 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 09:09 UTC Last updatedMost recent change to the record

Details

Published

2025-04-09 20:15 UTC

Last modified

2026-06-17 09:09 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-116

Record status

Analyzed

Affected

• Juniper Junos < 21.2
• Juniper Junos 21.2
• Juniper Junos 21.4
• Juniper Junos 22.2
• Juniper Junos 22.4
• Juniper Junos 23.2

Attack profile CVSS 4.0 · 6.9

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

Low