Juniper Junos OS/Junos OS Evolved prior 24.2R2 Layer 2 Control Protocol Daemon signed conversion

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Juniper Junos OS and Junos OS Evolved. This affects an unknown part of the component Layer 2 Control Protocol Daemon. The manipulation results in signed conversion. This vulnerability is cataloged as CVE-2025-30646. The attack must originate from the local network. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Juniper Junos OS and Junos OS Evolved. Affected is an unknown functionality of the component Layer 2 Control Protocol Daemon. The manipulation with an unknown input leads to a signed conversion vulnerability. CWE is classifying the issue as CWE-195. The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive. This is going to have an impact on availability. CVE summarizes:

A Signed to Unsigned Conversion Error vulnerability in the Layer 2 Control Protocol daemon (l2cpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated adjacent attacker sending a specifically malformed LLDP TLV to cause the l2cpd process to crash and restart, causing a Denial of Service (DoS).  Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. When an LLDP telemetry subscription is active, receipt of a specifically malformed LLDP TLV causes the l2cpd process to crash and restart. This issue affects: Junos OS: * All versions before 21.2R3-S9,  * from 21.4 before 21.4R3-S10,  * from 22.2 before 22.2R3-S6,  * from 22.4 before 22.4R3-S6,  * 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 before 21.4R3-S10-EVO, * from 22.2-EVO before 22.2R3-S6-EVO,  * from 22.4-EVO before 22.4R3-S6-EVO,  * from 23.2-EVO before 23.2R2-S3-EVO,  * from 23.4-EVO before 23.4R2-S4-EVO,  * from 24.2-EVO before 24.2R2-EVO.

The advisory is shared for download at supportportal.juniper.net. This vulnerability is traded as CVE-2025-30646 since 03/24/2025. The exploitability is told to be easy. The attack can only be done within the local network. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 234102 (Juniper Junos OS Vulnerability (JSA96456)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 21.2R3-S9, 21.4R3-S10, 22.2R3-S6, 22.4R3-S6, 23.2R2-S3, 23.4R2-S4 or 24.2R2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (234102). Once again VulDB remains the best source for vulnerability data.

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: 6.5
VulDB Meta Temp Score: 6.3

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

CNA Base Score: 6.5
CNA Vector (juniper): 🔍

CVSSv2info

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

Exploitinginfo

Class: Signed conversion
CWE: CWE-195 / CWE-194 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 234102
Nessus Name: Juniper Junos OS Vulnerability (JSA96456)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Junos OS/Junos OS Evolved 21.2R3-S9/21.4R3-S10/22.2R3-S6/22.4R3-S6/23.2R2-S3/23.4R2-S4/24.2R2

Timelineinfo

03/24/2025 🔍
04/09/2025 +15 days 🔍
04/09/2025 +0 days 🔍
01/26/2026 +292 days 🔍

Sourcesinfo

Vendor: juniper.net

Advisory: JSA96456
Status: Confirmed

CVE: CVE-2025-30646 (🔍)
GCVE (CVE): GCVE-0-2025-30646
GCVE (VulDB): GCVE-100-304284

Entryinfo

Created: 04/09/2025 22:29
Updated: 01/26/2026 22:31
Changes: 04/09/2025 22:29 (80), 04/10/2025 11:24 (2), 01/26/2026 22:31 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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