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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS | < 21.2R3-S9; >= 21.4, < 21.4R3-S10; >= 22.2, < 22.2R3-S6; >= 22.4, < 22.4R3-S6; >= 23.2, < 23.2R2-S3; >= 23.4, < 23.4R2-S4; >= 24.2, < 24.2R2 |
| Juniper Networks | Junos OS Evolved | < 21.4R3-S10-EVO; >= 22.2-EVO, < 22.2R3-S6-EVO; >= 22.4-EVO, < 22.4R3-S6-EVO; >= 23.2-EVO, < 23.2R2-S3-EVO; >= 23.4-EVO, < 23.4R2-S4-EVO; >= 24.2-EVO, < 24.2R2-EVO |
References
- https://supportportal.juniper.net/JSA96456Vendor Advisory
Timeline
- Published
- Apr 9, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed