# CVE-2026-102050: Juniper Networks Junos OS stack-based buffer overflow in l2cpd

Source: https://junglewise.ai/threats/cve-2026-102050-a-stack-based-buffer-overflow-vulnerability-in-the-l2cpd-daemon  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-102050 · Severity: high · CVSS 8.8 · Published 2026-10-14

Juniper Networks Junos OS contains a stack-based buffer overflow vulnerability in the l2cpd daemon, which handles Layer 2 control protocols like LLDP on network devices. An unauthenticated attacker on an adjacent network segment can send malicious LLDP packets to trigger a denial of service, disrupting Layer 2 control-plane processing and potentially affecting other control protocols across the device.

Technologies: [Juniper Networks Junos OS](https://junglewise.ai/threats/technologies/juniper-networks-junos-os), [Juniper Networks Junos OS Evolved](https://junglewise.ai/threats/technologies/junos-os-evolved). Vendors: [Juniper Networks](https://junglewise.ai/threats/vendors/juniper-networks).

## Quick answers

**Is CVE-2026-102050 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102050 being exploited in the wild.

**How severe is CVE-2026-102050?** High severity, with a CVSS score of 8.8, published 14 October 2026.

**Which products and versions are affected?** Juniper Networks Junos OS; Juniper Networks Junos OS Evolved.

**Is there a fix for CVE-2026-102050?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-102050 attacked?** It is attacked from the adjacent network, in an operating system.

**Am I affected by CVE-2026-102050?** Check whether you run Juniper Networks Junos OS or Juniper Networks Junos OS Evolved. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the l2cpd daemon when processing LLDP packets on interfaces configured for LLDP. An unauthenticated adjacent attacker can send crafted LLDP packets to overflow the stack, causing denial of service. Repeated exploitation may disrupt LLDP and other Layer 2 control protocols across the device.

## Affected products

- Juniper Networks Junos OS
- Juniper Networks Junos OS Evolved

## Timeline

- 2026-10-14: disclosed

## References

- [https://supportportal.juniper.net/JSA112187](https://supportportal.juniper.net/JSA112187)

## Related threats

- [Juniper Networks Junos OS stack buffer overflow in BGP/EVPN](https://junglewise.ai/threats/cve-2026-101982-a-stack-based-buffer-overflow-vulnerability-in-the-routing)
- [Juniper Networks Junos OS stack buffer overflow in rpd](https://junglewise.ai/threats/cve-2026-101981-a-stack-based-buffer-overflow-vulnerability-in-the-routing)
- [Juniper Junos OS routing protocol daemon crash in ISO-VPN](https://junglewise.ai/threats/cve-2026-101952-an-improper-validation-of-consistency-within-input-vulnerability)
- [Juniper Networks Junos OS stack buffer overflow in BGP routing daemon](https://junglewise.ai/threats/cve-2026-102178-a-stack-based-buffer-overflow-vulnerability-in-the-bgp-routing)
- [Juniper Junos buffer overflow in SDK service process](https://junglewise.ai/threats/cve-2026-102176-a-buffer-copy-without-checking-size-of-input-classic-buffer)