Vulnerability in Juniper Junos
CVE-2025-30657
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (31.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Juniper Junos — versions 21.2, 21.4, 22.2
- Juniper Networks Junos OS — versions 0, 21.4, 22.2
Weakness classification (CWE)
References
- supportportal.juniper.net/JSA96467 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-30657?
- CVE-2025-30657 is a medium-severity vulnerability in Juniper Junos, classified under Improper Encoding or Escaping of Output. CVSS score: 5.3/10. Published 2025-04-09.
- How severe is CVE-2025-30657?
- Medium severity. CVSS v3 base score is 5.3 out of 10.