Buffer Size Calculation Flaw in Junos OS Routing Protocol Daemon
CVE-2025-52955

7.1HIGH

Key Information:

Vendor

Juniper Networks
Status
Junos Os
Vendor
CVE Published:
11 July 2025

Badges

👾 Exploit Exists

What is CVE-2025-52955?

A vulnerability in the routing protocol daemon (rpd) of Juniper Networks' Junos OS may allow an adjacent unauthenticated attacker to trigger memory corruption. This issue occurs when a logical interface related to a routing instance flaps continuously, leading to the transmission of specific updates to the jflow/sflow modules, which ultimately destabilizes the rpd. This instability can result in the rpd crashing and automatically restarting, causing a persistent Denial of Service condition when these updates are continually processed.

Affected Version(s)

Junos OS 0 < 21.2R3-S9

Junos OS 21.4 < 21.4*

Junos OS 22.2 < 22.2*

References

https://supportportal.juniper.net/JSA100062
vendor-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-52955 : Buffer Size Calculation Flaw in Junos OS Routing Protocol Daemon