What is the CVSS score of CVE-2025-52949?

CVE-2025-52949 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Junos are affected by CVE-2025-52949?

CVE-2025-52949 presents notable security risk rated CVSS 6.5. Exploitation could compromise the security of affected deployments.. A patch is available.

How to fix or mitigate CVE-2025-52949?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Junos CVE-2025-52949

EUVD-2025-21155 MEDIUM

Improper Handling of Length Parameter Inconsistency (CWE-130)

2025-07-11 sirt@juniper.net

Juniper Denial Of Service Junos Junos Os Evolved

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

24.2R2-S1,24.4R1-S3,23.4R2-S5

EUVD ID Assigned

Mar 16, 2026 - 08:17 euvd

EUVD-2025-21155

Analysis Generated

Mar 16, 2026 - 08:17 vuln.today

CVE Published

Jul 11, 2025 - 15:15 nvd

MEDIUM 6.5

DescriptionCVE.org

An Improper Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a logically adjacent BGP peer sending a specifically malformed BGP packet to cause rpd to crash and restart, resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.

Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.

This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:

Junos OS:

all versions before 21.4R3-S11,
from 22.2 before 22.2R3-S7,
from 22.4 before 22.4R3-S7,
from 23.2 before 23.2R2-S4,
from 23.4 before 23.4R2-S5,
from 24.2 before 24.2R2-S1,
from 24.4 before 24.4R1-S3, 24.4R2;

Junos OS Evolved:

all versions before 22.2R3-S7-EVO,
from 22.4-EVO before 22.4R3-S7-EVO,
from 23.2-EVO before 23.2R2-S4-EVO,
from 23.4-EVO before 23.4R2-S5-EVO,
from 24.2-EVO before 24.2R2-S1-EVO,
from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.

Analysis

Only systems configured for Ethernet Virtual Private Networking (EVPN) signaling are vulnerable to this issue.

This issue affects iBGP and eBGP, and both IPv4 and IPv6 are affected by this vulnerability.This issue affects:

Junos OS:

all versions before 21.4R3-S11,
from 22.2 before 22.2R3-S7,
from 22.4 before 22.4R3-S7,
from 23.2 before 23.2R2-S4,
from 23.4 before 23.4R2-S5,
from 24.2 before 24.2R2-S1,
from 24.4 before 24.4R1-S3, 24.4R2;

Junos OS Evolved:

all versions before 22.2R3-S7-EVO,
from 22.4-EVO before 22.4R3-S7-EVO,
from 23.2-EVO before 23.2R2-S4-EVO,
from 23.4-EVO before 23.4R2-S5-EVO,
from 24.2-EVO before 24.2R2-S1-EVO,
from 24.4-EVO before 24.4R1-S3-EVO, 24.4R2-EVO.

Technical ContextAI

A denial of service vulnerability allows an attacker to disrupt the normal functioning of a system, making it unavailable to legitimate users.

RemediationAI

Implement rate limiting and input validation. Use timeout mechanisms for resource-intensive operations. Deploy DDoS protection where applicable.

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CVE-2025-52949 vulnerability details – vuln.today

Back

Junos CVE-2025-52949

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

Analysis

Technical ContextAI

RemediationAI

More in Junos

Same weakness CWE-130 – Improper Handling of Length Parameter Inconsistency

Same technique Denial Of Service

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External POC / Exploit Code