CWE-761

Free of Pointer not at Start of Buffer

The product calls free() on a pointer to a memory resource that was allocated on the heap, but the pointer is not at the start of the buffer.

CVE-2025-47749 (GCVE-0-2025-47749)
Vulnerability from cvelistv5
Published
2025-05-19 07:43
Modified
2025-05-19 15:27
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.4 (High) - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-761 - Free of pointer not at start of buffer
Summary
V-SFT v6.2.5.0 and earlier contains an issue with free of pointer not at start of buffer in VS6EditData.dll!CWinFontInf::WinFontMsgCheck function. Opening specially crafted V7 or V8 files may lead to crash, information disclosure, and arbitrary code execution.
References
Impacted products
Vendor Product Version
FUJI ELECTRIC CO., LTD. V-SFT Version: v6.2.5.0 and earlier
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Mitigation

Phase: Implementation

Description:

  • When utilizing pointer arithmetic to traverse a buffer, use a separate variable to track progress through memory and preserve the originally allocated address for later freeing.
Mitigation

Phase: Implementation

Description:

  • When programming in C++, consider using smart pointers provided by the boost library to help correctly and consistently manage memory.
Mitigation ID: MIT-4.6

Phase: Architecture and Design

Strategy: Libraries or Frameworks

Description:

  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • For example, glibc in Linux provides protection against free of invalid pointers.
Mitigation

Phase: Architecture and Design

Description:

  • Use a language that provides abstractions for memory allocation and deallocation.
Mitigation

Phase: Testing

Description:

  • Use a tool that dynamically detects memory management problems, such as valgrind.

No CAPEC attack patterns related to this CWE.

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