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October 15, 2026

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CVE-2026-103994NVD

Vulnerability Summary

A Heap-based Buffer Overflow vulnerability in the VXLAN Gateway Daemon (vgd) of Juniper Networks Junos OS allows a malicious or compromised SDN-controller to cause a complete outage of the OVSDB control plane and possibly remote code execution.
Severity Level
HIGH(8.7)
Published Date
Oct 14, 2026
Last Modified
Oct 15, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
Data Pending
Root Weakness (CWE)
CWE-122: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v4.0 Base Metrics — Score 8.7 (HIGH)
Attack VectorAdjacent
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)Low
CVSS v3.1 Base Metrics — Score 8.8 (HIGH)
Attack VectorAdjacent
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Juniper Networks Junos OS < 23.2R2-S7.7
  • Juniper Networks Junos OS >= 23.4 and < 23.4R2-S8.13
  • Juniper Networks Junos OS >= 24.2 and < 24.2R2-S5.5
  • Juniper Networks Junos OS >= 24.4 and < 24.4R2-S5
  • Juniper Networks Junos OS >= 25.2 and < 25.2R2-S2
  • Juniper Networks Junos OS >= 25.4 and < 25.4R1-S3
  • Juniper Networks Junos OS >= 26.2 and < 26.2R1-S2
Patched Versions
  • Juniper Networks Junos OS 23.2R2-S7.7
  • Juniper Networks Junos OS 23.4R2-S8.13
  • Juniper Networks Junos OS 24.2R2-S5.5
  • Juniper Networks Junos OS 24.4R2-S5
  • Juniper Networks Junos OS 25.2R2-S2
  • Juniper Networks Junos OS 25.4R1-S3
  • Juniper Networks Junos OS 26.2R1-S2
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References