NTLM credential disclosure via unsafe OLE link conversion
Published Oct 10, 2023 · Updated Oct 21, 2025
Information disclosure in WordPad on affected Windows releases allows remote attackers to obtain NTLM credentials through a crafted RTF file. WordPad delegates an untrusted OLESTREAM to OleConvertOLESTREAMToIStorage, which automatically authenticates to a linked object's remote source. Exploitation requires the user to open the document; the attacker can capture the resulting NTLM authentication material.
Summary
What happened
Information disclosure in WordPad on affected Windows releases allows remote attackers to obtain NTLM credentials through a crafted RTF file. WordPad delegates an untrusted OLESTREAM to OleConvertOLESTREAMToIStorage, which automatically authenticates to a linked object's remote source. Exploitation requires the user to open the document; the attacker can capture the resulting NTLM authentication material.
The record
- CVE
- CVE-2023-36563
- Published
- Oct 10, 2023
- Updated
- Oct 21, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- CWE-20, T1187, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 10, 2023CVE publishedPublication date reported by the CVE source.
- Oct 21, 2025Record 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.
- Affected versionversion=10.0.10240.0 <10.0.10240.20232
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- WordPad OLE LinkedObject working exploit analysisfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog listingknown exploited catalog
Technologies
Your stack
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Your stack
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