Service crash via unbounded log-message copy
Published Feb 12, 2026 · Updated Feb 12, 2026
Heap buffer overflow in Open TFTP Server MultiThreaded 1.7 allows remote attackers to crash the service with crafted TFTP packets. In processRequest, a negotiated large block buffer holding attacker data is reused for an ERROR log message and copied by sprintf into a fixed-size stack buffer without a length check. The demonstrated path requires allowed write operations and a large blksize negotiation; the resulting pointer corruption terminates the Windows service.
Summary
What happened
Heap buffer overflow in Open TFTP Server MultiThreaded 1.7 allows remote attackers to crash the service with crafted TFTP packets. In processRequest, a negotiated large block buffer holding attacker data is reused for an ERROR log message and copied by sprintf into a fixed-size stack buffer without a length check. The demonstrated path requires allowed write operations and a large blksize negotiation; the resulting pointer corruption terminates the Windows service.
The record
- CVE
- CVE-2025-67433
- Published
- Feb 12, 2026
- Updated
- Feb 12, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-122, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 12, 2026CVE publishedPublication date reported by the CVE source.
- Feb 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
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.
Public exploit references
- Open TFTP Server MultiThreaded 1.7 packet-sequence proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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