CVE-2021-21469Network attack vector

Sensitive-data exposure via attacker-controlled UNC paths

Published Jan 12, 2021 · Updated Aug 3, 2024

Information disclosure in SAP NetWeaver Master Data Management on Windows allows remote attackers to expose sensitive data via UNC paths. The MDS server accepts custom UNC paths in its configuration and causes Windows to initiate SMB authentication to an attacker-controlled share, enabling relay. Reachability requires an inadequately protected MDS configuration, such as an unset server password, plus permissive network and OS controls; SAP reports confidentiality impact only.

CVSS severity5.3
Medium
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in SAP NetWeaver Master Data Management on Windows allows remote attackers to expose sensitive data via UNC paths. The MDS server accepts custom UNC paths in its configuration and causes Windows to initiate SMB authentication to an attacker-controlled share, enabling relay. Reachability requires an inadequately protected MDS configuration, such as an unset server password, plus permissive network and OS controls; SAP reports confidentiality impact only.

The record

CVE
CVE-2021-21469
Published
Jan 12, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver Master Data Management Server
Classifications
CWE-200, T1557.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 710
  2. Affected versionversion=< 7.10
  3. Affected versionversion=< 710.750

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver Master Data Management Serverversion=< 710; version=< 7.10; version=< 710.750

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3SAP SECVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1557.001Adversary-in-the-Middle: Name Resolution Poisoning and SMB Relay

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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