Technical Analysis of CVE-2025-53149: Heap-based Buffer Overflow in Windows Kernel Streaming Driver
By
ankitg12
A second-rack bagel that's nearly first-rack. Tasty stuff.
Summary
Researchers discovered CVE-2025-53149, a heap-based buffer overflow vulnerability in the Windows Kernel Streaming WOW Thunk Service Driver (ksthunk.sys). The vulnerability was responsibly disclosed to Microsoft, who patched it on August 12, 2025. The article provides technical details about the vulnerability in the ksthunk.sys driver with SHA-1 hash 68B5B527550731DD657BF8F1E8FA31E895A7F176, though the vulnerability was not immediately useful for exploitation operations.
Key quotes
· 4 pulledFrom time to time, while digging through internals during our research, we stumble upon quirks or vulnerabilities that, although not immediately useful for operations or exploitation, are still noteworthy.
Rather than letting these findings fade away, we decided to responsibly disclose them to the vendor.
One such case is CVE-2025-53149, a heap-based buffer overflow in the Kernel Streaming WOW Thunk Service Driver, which Microsoft patched on August 12, 2025.
The vulnerable component is the ksthunk.sys driver, SHA-1 68B5B527550731DD657BF8F1E8FA31E895A7F176.
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