Juniper Junos OS up to 24.2R1 Routing Protocol Daemon buffer size

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Juniper Junos OS up to 21.2R3-S8/22.4R3-S6/23.2R2-S2/23.4R2-S3/24.2R1. The affected element is an unknown function of the component Routing Protocol Daemon. The manipulation leads to buffer size. This vulnerability is uniquely identified as CVE-2025-52955. The attack can only be initiated within the local network. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Juniper Junos OS up to 21.2R3-S8/22.4R3-S6/23.2R2-S2/23.4R2-S3/24.2R1 and classified as critical. This issue affects some unknown functionality of the component Routing Protocol Daemon. The manipulation with an unknown input leads to a buffer size vulnerability. Using CWE to declare the problem leads to CWE-131. The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at supportportal.juniper.net. The identification of this vulnerability is CVE-2025-52955 since 06/23/2025. The exploitation is known to be easy. The attack can only be initiated within the local network. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/24/2026).

The vulnerability scanner Nessus provides a plugin with the ID 241653 (Juniper Junos OS Vulnerability (JSA100062)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 21.2R3-S9, 21.4*, 22.2*, 22.4R3-S7, 23.2R2-S3, 23.4R2-S4 or 24.2R2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (241653), EUVD (EUVD-2025-21163) and CERT Bund (WID-SEC-2025-1519). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Juniper MX Series
  • Juniper JUNOS
  • Juniper SRX Series
  • Juniper Security Director
  • Juniper Junos Space

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.1
CNA Vector (juniper): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer size
CWE: CWE-131 / CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 241653
Nessus Name: Juniper Junos OS Vulnerability (JSA100062)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Junos OS 21.2R3-S9/21.4*/22.2*/22.4R3-S7/23.2R2-S3/23.4R2-S4/24.2R2

Timelineinfo

06/23/2025 CVE reserved
07/11/2025 +18 days Advisory disclosed
07/11/2025 +0 days VulDB entry created
01/24/2026 +197 days VulDB entry last update

Sourcesinfo

Vendor: juniper.net

Advisory: JSA100062
Status: Confirmed

CVE: CVE-2025-52955 (🔒)
GCVE (CVE): GCVE-0-2025-52955
GCVE (VulDB): GCVE-100-316157
EUVD: 🔒
CERT Bund: WID-SEC-2025-1519 - Juniper JUNOS: Mehrere Schwachstellen ermöglichen Privilegieneskalation

Entryinfo

Created: 07/11/2025 20:23
Updated: 01/24/2026 07:56
Changes: 07/11/2025 20:23 (77), 07/12/2025 08:17 (2), 07/15/2025 01:48 (1), 08/08/2025 19:48 (11), 08/21/2025 01:35 (2), 10/12/2025 02:22 (7), 01/24/2026 07:56 (1)
Complete: 🔍
Cache ID: 216::103

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