CVE-2025-52955

Junos OS: When jflow/sflow is configured continuous logical interface flaps causes rpd crash and restart

Description

An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash.  When the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart.  Continued receipt of these specific updates will cause a sustained Denial of Service condition. This issue affects Junos OS: * All versions before 21.2R3-S9, * All versions of 21.4, * All versions of 22.2, * from 22.4 before 22.4R3-S7, * from 23.2 before 23.2R2-S3, * from 23.4 before 23.4R2-S4, * from 24.2 before 24.2R2.

Remediation

Solution:

  • The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S9, 22.4R3-S7, 23.2R2-S3, 23.4R2-S4, 24.2R2, 24.4R1, and all subsequent releases.

Workaround:

  • There are no known workarounds for this issue.

Category

7.1
CVSS
Severity: High
CVSS 4.0 •
CVSS 3.1 •
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://supportportal.juniper.net/JSA100062 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-52955?
CVE-2025-52955 has been scored as a high severity vulnerability.
How to fix CVE-2025-52955?
To fix CVE-2025-52955: The following software releases have been updated to resolve this specific issue: Junos OS: 21.2R3-S9, 22.4R3-S7, 23.2R2-S3, 23.4R2-S4, 24.2R2, 24.4R1, and all subsequent releases.
Is CVE-2025-52955 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-52955 is being actively exploited.
What software or system is affected by CVE-2025-52955?
CVE-2025-52955 affects Juniper Networks Junos OS.
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