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Vulnerability record · CVE-2019-0626 · published 5 March 2019

CVE-2019-0626: Windows Server DHCP Service Memory Corruption RCE

Microsoft · Windows 10

The Windows Server DHCP service contains an out-of-bounds write (CWE-787) that corrupts memory when it processes specially crafted packets. A remote, unauthenticated attacker can trigger it by sending crafted traffic to a DHCP server, and successful exploitation can lead to remote code execution. Because DHCP servers are typically reachable from the local network and often from untrusted segments, this is a high-value target for lateral movement and network-wide compromise.

9.8 CVSS 3.0 Critical EPSS 69% · top 0.7% CWE-787 · Out-of-bounds write
9.8CVSS 3.0 base score, v2 7.5
69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

A memory corruption vulnerability exists in the Windows Server DHCP service when an attacker sends specially crafted packets to a DHCP server, aka 'Windows DHCP Server Remote Code Execution Vulnerability'.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 19 September 2026. Confidence: high.

critical priorityCVSS 9.8 with network reachability, no authentication, and no user interaction, combined with a very high EPSS percentile, makes this a top-priority patch for any exposed Windows DHCP server.

What it is

The Windows Server DHCP service contains an out-of-bounds write (CWE-787) that corrupts memory when it processes specially crafted packets. A remote, unauthenticated attacker can trigger it by sending crafted traffic to a DHCP server, and successful exploitation can lead to remote code execution. Because DHCP servers are typically reachable from the local network and often from untrusted segments, this is a high-value target for lateral movement and network-wide compromise.

Impact

An attacker can execute arbitrary code in the context of the DHCP service on the target server, potentially gaining full control of that host. From there they could pivot to other systems, alter DHCP leases, or disrupt network addressing.

Attack surface

Reachable over the network via the DHCP service (UDP ports 67/68) by sending specially crafted packets; no authentication or user interaction is required per the CVSS vector (AV:N/AC:L/PR:N/UI:N).

Exploitation

Not listed in CISA KEV and no public exploit or ransomware association is recorded, but EPSS is very high (0.69345, 99.3rd percentile), indicating elevated likelihood of attempted exploitation. The Microsoft advisory is tagged as a patch reference.

What to do

  • Apply the Microsoft security update for CVE-2019-0626 to all affected Windows versions as soon as possible.
  • Restrict network access to DHCP servers so only trusted clients and relay agents can reach UDP 67/68.
  • Segment DHCP servers away from untrusted networks and limit management-plane exposure.
  • Monitor DHCP servers for crashes or unexpected service restarts and investigate promptly.
  • If DHCP is not required on a host, disable the DHCP Server role to remove the attack surface.

Detection

  • Monitor Windows event logs and service state for unexpected DHCP Server service crashes or restarts.
  • Inspect network traffic for malformed or unusually large DHCP packets directed at UDP 67/68.
  • Alert on new or anomalous processes spawned by the DHCP service (svchost.exe hosting DHCP) on server hosts.
  • Correlate DHCP server instability with concurrent scanning or unusual traffic from internal hosts.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/106887 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0626 PatchVendor Advisory
http://www.securityfocus.com/bid/106887 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0626 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-0626), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.