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Vulnerability · Published Apr 9, 2025 · Assigned by juniper

CVE-2025-30646Junos OS and Junos OS Evolved: Receipt of a malformed LLDP TLV results in l2cpd crash

Medium 6.5

In plain English

A medium-severity security flaw in Junos OS from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.2%top 83.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

VendorProductVersions
Juniper Networks Junos OS 0 – before 21.2R3-S921.4 – before 21.4R3-S1022.2 – before 22.2R3-S622.4 – before 22.4R3-S623.2 – before 23.2R2-S323.4 – before 23.4R2-S424.2 – before 24.2R2
Juniper Networks Junos OS Evolved 0 – before 21.4R3-S10-EVO22.2-EVO – before 22.2R3-S6-EVO22.4-EVO – before 22.4R3-S6-EVO23.2-EVO – before 23.2R2-S3-EVO23.4-EVO – before 23.4R2-S4-EVO24.2-EVO – before 24.2R2-EVO

Weakness: CWE-195 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References