Cross-client DNS query disclosure via shared TCP buffering
Published Oct 24, 2025 · Updated Oct 24, 2025
Information disclosure in Simple DNS Plus 9 allows remote attackers with DNS query access to read other clients' DNS queries. The DNS-over-TCP connection handler trusts the two-byte length prefix and reuses buffering across concurrent clients, causing one client's request payload to be returned on another connection. Access to the server's TCP DNS listener is required; smaller declared lengths increase leakage, and the demonstrated consequence is disclosure of query contents.
Summary
What happened
Information disclosure in Simple DNS Plus 9 allows remote attackers with DNS query access to read other clients' DNS queries. The DNS-over-TCP connection handler trusts the two-byte length prefix and reuses buffering across concurrent clients, causing one client's request payload to be returned on another connection. Access to the server's TCP DNS listener is required; smaller declared lengths increase leakage, and the demonstrated consequence is disclosure of query contents.
The record
- CVE
- CVE-2025-61430
- Published
- Oct 24, 2025
- Updated
- Oct 24, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-350
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 24, 2025CVE publishedPublication date reported by the CVE source.
- Oct 24, 2025Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- Cross-client request leakage reproduction scriptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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