Juniper Junos OS DoS via rpd Buffer Overflow (v < 24.2R2)
CVE-2025-52955 Published on July 11, 2025
Junos OS and Junos OS Evolved: When jflow/sflow is configured continuous logical interface flaps causes rpd crash and restart
An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved 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.
Junos OS Evolved:
* All versions of 21.2-EVO,
* All versions of 21.4-EVO,
* All versions of 22.2-EVO,
* from 22.4 before 22.4R3-S7-EVO,
* from 23.2 before 23.2R2-S3-EVO,
* from 23.4 before 23.4R2-S4-EVO,
* from 24.2 before 24.2R2-EVO.
Vulnerability Analysis
Weakness Type
Incorrect Calculation of Buffer Size
The software does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
Products Associated with CVE-2025-52955
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Affected Versions
Juniper Networks Junos OS:- Before 21.2R3-S9 is affected.
- Version 21.4 and below 21.4* is affected.
- Version 22.2 and below 22.2* is affected.
- Version 22.4 and below 22.4R3-S7 is affected.
- Version 23.2 and below 23.2R2-S3 is affected.
- Version 23.4 and below 23.4R2-S4 is affected.
- Version 24.2 and below 24.2R2 is affected.
- Before 21.2*-EVO is affected.
- Version 21.4 and below 21.4*-EVO is affected.
- Version 22.2 and below 22.2*-EVO is affected.
- Version 22.4 and below 22.4R3-S7-EVO is affected.
- Version 23.2 and below 23.2R2-S3-EVO is affected.
- Version 23.4 and below 23.4R2-S4-EVO is affected.
- Version 24.2 and below 24.2R2-EVO is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.