CVEvulnerability

CVE-2020-1472

5.5 MEDIUM Known exploited Published 2020-08-17 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Netlogon Privilege Escalation Vulnerability — Microsoft Netlogon

Microsoft's Netlogon Remote Protocol (MS-NRPC) contains a privilege escalation vulnerability when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller. An attacker who successfully exploits the vulnerability could run a specially crafted application on a device on the network. The vulnerability is also known under the moniker of Zerologon.

Added to KEV: 2021-11-03
Remediation due: 2022-05-03
Ransomware use: Known
Required action: Apply updates per vendor instructions.
Notes: Reference CISA's ED 20-04 (https://www.cisa.gov/news-events/directives/ed-20-04-mitigate-netlogon-elevation-privilege-vulnerability-august-2020-patch-tuesday) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 20-04. https://nvd.nist.gov/vuln/detail/CVE-2020-1472

Status: Analyzed
Published: 2020-08-17
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 ([email protected]): 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS 3.1 ([email protected]): 10.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0 ([email protected]): 9.3 HIGH — AV:N/AC:M/Au:N/C:C/I:C/A:C

Description

An elevation of privilege vulnerability exists when an attacker establishes a vulnerable Netlogon secure channel connection to a domain controller, using the Netlogon Remote Protocol (MS-NRPC). An attacker who successfully exploited the vulnerability could run a specially crafted application on a device on the network. To exploit the vulnerability, an unauthenticated attacker would be required to use MS-NRPC to connect to a domain controller to obtain domain administrator access. Microsoft is addressing the vulnerability in a phased two-part rollout. These updates address the vulnerability by modifying how Netlogon handles the usage of Netlogon secure channels. For guidelines on how to manage the changes required for this vulnerability and more information on the phased rollout, see How to manage the changes in Netlogon secure channel connections associated with CVE-2020-1472 (updated September 28, 2020). When the second phase of Windows updates become available in Q1 2021, customers will be notified via a revision to this security vulnerability. If you wish to be notified when these updates are released, we recommend that you register for the security notifications mailer to be alerted of content changes to this advisory. See Microsoft Technical Security Notifications.

Affected configurations

• microsoft windows server 1903 • microsoft windows server 1909 • microsoft windows server 2004 • microsoft windows server 2008 r2 • microsoft windows server 2012 • microsoft windows server 2012 r2 • microsoft windows server 2016 • microsoft windows server 2019 • microsoft windows server 20h2 • fedoraproject fedora 31 • fedoraproject fedora 32 • fedoraproject fedora 33 • opensuse leap 15.1 • opensuse leap 15.2 • canonical ubuntu linux 14.04 • canonical ubuntu linux 16.04 • canonical ubuntu linux 18.04 • canonical ubuntu linux 20.04 • synology directory server (< 4.4.5-0101) • samba samba (< 4.10.18) • samba samba (>= 4.11.0 < 4.11.13) • samba samba (>= 4.12.0 < 4.12.7) • debian debian linux 9.0 • oracle zfs storage appliance kit 8.8

Referenced by CWE · observed example (1)

CWE-1204 Generation of Weak Initialization Vector (IV) weakness

References