Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Unauthenticated remote packet to the IKE listener (AV:N/AC:L/PR:N/UI:N) causes a crash with availability-only impact (A:H) and no C/I loss.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows Internet Key Exchange (IKE) Protocol allows an unauthorized attacker to deny service over a network.
AnalysisAI
Network denial of service in the Windows Internet Key Exchange (IKE) protocol implementation allows an unauthenticated remote attacker to crash affected systems by triggering a heap-based buffer overflow. All impact is to availability only (CVSS 7.5, A:H, no confidentiality or integrity loss), making this a reliability/uptime threat against IPsec/VPN-facing Windows 10, Windows 11, and Windows Server hosts rather than a code-execution vulnerability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to have the Windows IKE/IPsec service (IKEEXT) running and its IKE listener reachable by the attacker over the network - typically UDP port 500 and/or UDP 4500 (NAT-T) exposed to untrusted networks, as on VPN/IPsec gateways. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) describes an easily reachable, unauthenticated, no-interaction network attack whose sole impact is availability - consistent with the description's 'deny service over a network.' The 7.5 score is driven entirely by A:H; there is no confidentiality or integrity exposure, so this is not an RCE despite being a heap overflow (memory corruption in this case manifests as a crash rather than confirmed code execution). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach a Windows host's IKE listener (UDP 500/4500) - for example an internet-facing VPN gateway - sends a specially crafted IKE negotiation packet that overflows a heap buffer during key-exchange parsing, crashing the IKE service or the system and dropping all IPsec/VPN connectivity. No authentication or user interaction is required (PR:N/UI:N) and complexity is low (AC:L), so the attack can be repeated to sustain an outage; no public exploit is identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-50696; Patch available per vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50696, where the exact fixed build per Windows SKU is listed (no single cross-SKU version string is provided in the input, so consult the advisory for your specific edition). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 10, 11, and Server systems with internet-accessible or externally-facing IPsec endpoints, prioritizing VPN concentrators and remote access infrastructure. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44000
GHSA-cmjw-3xhh-prg6