Local memory disclosure through DNS queries
Published Jan 12, 2021 · Updated Oct 8, 2024
An information disclosure flaw in Windows DNS Query allows local users to read uninitialized memory through a crafted DNS query. Microsoft has not disclosed the affected function or the operation that leaves DNS query output backed by uninitialized memory. Exploitation requires low-privileged local code execution and exposes memory contents without reported data modification or service interruption.
Summary
What happened
An information disclosure flaw in Windows DNS Query allows local users to read uninitialized memory through a crafted DNS query. Microsoft has not disclosed the affected function or the operation that leaves DNS query output backed by uninitialized memory. Exploitation requires low-privileged local code execution and exposes memory contents without reported data modification or service interruption.
The record
- CVE
- CVE-2021-1637
- Published
- Jan 12, 2021
- Updated
- Oct 8, 2024
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 12, 2021CVE publishedPublication date reported by the CVE source.
- Oct 8, 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?
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- Affected versionversion=10.0.0 <publication
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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