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%.

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

Q: 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.

EUVD-2025-21155 MEDIUM

Improper Handling of Length Parameter Inconsistency (CWE-130)

2025-07-11 sirt@juniper.net

Denial Of Service Juniper Junos Junos Os Evolved

6.5

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-130 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Length parameter validation
Impact	Service disruption affecting availability. In critical infrastructure, DoS can have cascading effects on dependent systems. With a CVSS score of 6.5 (MEDIUM), this represents a moderate risk.
Exploit ScenarioDerived	An attacker sends specially crafted requests that cause excessive resource consumption (CPU, memory, disk) or trigger a crash in the target application.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

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.

Earlier versions of this analysis (1)

v1 Mar 16, 2026 - 08:17 CVSS 6.5

RemediationAI

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

Affected VersionsENISA

Junos OS 24.2 <24.2R2-S1

Junos OS 24.4 <24.4R1-S3, 24.4R2

Junos OS 23.4 <23.4R2-S5

Junos OS Evolved 23.2-EVO <23.2R2-S4-EVO

Junos OS 23.2 <23.2R2-S4

Junos OS 22.4 <22.4R3-S7

Junos OS Evolved 23.4-EVO <23.4R2-S5-EVO

Junos OS Evolved 24.2-EVO <24.2R2-S1-EVO

Junos OS 0 <21.4R3-S11

Junos OS Evolved 24.4-EVO <24.4R1-S3-EVO, 24.4R2-EVO

Junos OS 22.2 <22.2R3-S7

Junos OS Evolved 22.4-EVO <22.4R3-S7-EVO

Junos OS Evolved 0 <22.2R3-S7-EVO

Affected Packages

euvd junos_os fix: 21.4R3-S11, 22.2R3-S7, 22.4R3-S7, 23.2R2-S4, 23.4R2-S5, 24.2R2-S1

euvd junos_os_24_4_24_4r1_s3 no fix

euvd junos_os_evolved fix: 22.2R3-S7-EVO, 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S5-EVO, 24.2R2-S1-EVO

euvd junos_os_evolved_24_4_evo_24_4r1_s3_evo no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 4 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

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

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

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

CVE Published

Jul 11, 2025 - 15:15 nvd

MEDIUM 6.5

Executive ViewAI

Why It Matters

CVE-2025-52949 presents notable security risk rated CVSS 6.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% exploitable

Data Quality

4 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived

None

System Exposure· derived

Controlled

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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References

Advisories & patches

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-52949 ADVISORY https://supportportal.juniper.net/JSA100053

Search Externally

GitHub PoC

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