Advisory severityHigh8.8Juniper Networks

High [CVE-2026-102050] Junos OS and Junos OS Evolved: An adjacent attacker causes Layer 2 control-plane denial of service when LLDP is enabled

This high-severity Juniper Networks advisory covers CVE-2026-102050 affecting Junos OS Evolved.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-102050 Source published Oct 15, 2026Source updated Oct 17, 2026

VulniPulse record published Oct 15, 2026Record updated Oct 17, 2026

CVE-2026-102050

Affected products & platforms

Juniper NetworksJunosJunos OS Evolved

Open source advisory

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Summary

A Stack-based Buffer Overflow vulnerability in the l2cpd daemon of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a denial of service in Layer 2 control-plane processing via LLDP packets received on an interface configured for LLDP.

Repeated triggering may disrupt LLDP and other Layer 2 control protocols across the device.

Affected versions

Junos OS before 23.2R2-S7.7
Junos OS 23.4 before 23.4R2-S8.13
Junos OS 24.2 before 24.2R2-S5.5
Junos OS 24.4 before 24.4R2-S5
Junos OS 25.2 before 25.2R2-S2
Junos OS 25.4 before 25.4R1-S3
Junos OS 26.2 before 26.2R1-S2
Junos OS Evolved before 23.2R2-S7.7-EVO
Junos OS Evolved 23.4 before 23.4R2-S8.11-EVO
Junos OS Evolved 24.2 before 24.2R2-S5.6-EVO
Junos OS Evolved 24.4 before 24.4R2-S5-EVO
Junos OS Evolved 25.2 before 25.2R2-S2-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions

23.2R2-S7.7
23.4R2-S8.13
24.2R2-S5.5
24.4R2-S5
25.2R2-S2
25.4R1-S3
26.2R1-S2
23.2R2-S7.7-EVO
23.4R2-S8.11-EVO
24.2R2-S5.6-EVO
24.4R2-S5-EVO
25.2R2-S2-EVO

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: 23.2R2-S7.7, 23.4R2-S8.13, 24.2R2-S5.5, 24.4R2-S5, 25.2R2-S2, 25.4R1-S3. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Juniper Networks
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-102050 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-102050NVD CVE.org MITRE

Official resources

Junos OS software downloads & install/upgrade (target: 23.2R2-S7.7 / 23.4R2-S8.13 / 24.2R2-S5.5)
Official documentation
This advisory names 23.2R2-S7.7 / 23.4R2-S8.13 / 24.2R2-S5.5 as the first fixed releases — official upgrade documentation for Junos OS on SRX / MX / EX / QFX.
Junos OS release & EOL / support dates
Release notes
Confirm your train is still supported and pick a fixed maintenance release.
Juniper Security Advisories portal
Official documentation
Canonical Juniper SIRT advisory portal — search here for the full JSA text and revisions.

Discussion(0)

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