CVE-2025-57632
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-25

Last updated on: 2025-09-26

Assigner: MITRE

Description
libsmb2 6.2+ is vulnerable to Buffer Overflow. When processing SMB2 chained PDUs (NextCommand), libsmb2 repeatedly calls smb2_add_iovector() to append to a fixed-size iovec array without checking the upper bound of v->niov (SMB2_MAX_VECTORS=256). An attacker can craft responses with many chained PDUs to overflow v->niov and perform heap out-of-bounds writes, causing memory corruption, crashes, and potentially arbitrary code execution. The SMB2_OPLOCK_BREAK path bypasses message ID validation.
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Meta Information
Published
2025-09-25
Last Modified
2025-09-26
Generated
2026-06-16
AI Q&A
2025-09-25
EPSS Evaluated
2026-06-15
NVD
CVE-2025-57632
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
sahlberg libsmb2 *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
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Executive Summary

This vulnerability is a buffer overflow in libsmb2 version 6.2 and later. It occurs when processing SMB2 chained PDUs (NextCommand). The library repeatedly appends to a fixed-size array without checking its upper limit, allowing an attacker to overflow the array and cause heap out-of-bounds writes. This can lead to memory corruption, crashes, and potentially arbitrary code execution. Additionally, the SMB2_OPLOCK_BREAK path bypasses message ID validation, increasing the risk.

Impact Analysis

This vulnerability can impact you by causing memory corruption and application crashes when processing malicious SMB2 responses. More seriously, it can allow an attacker to execute arbitrary code on the affected system, potentially leading to full system compromise or unauthorized access.

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