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How the CVE Works
CVE-2025-48812 is an out-of-bounds read vulnerability in Microsoft Office Excel. When a maliciously crafted Excel file is opened, the software fails to properly validate memory ranges during data parsing. This allows an attacker to read sensitive data beyond the intended buffer, potentially exposing confidential information stored in memory. The flaw occurs due to improper boundary checks when processing certain Excel spreadsheet elements, such as malformed cell structures or corrupted formula references. Exploitation requires user interaction (opening a malicious file) but can lead to local information disclosure without additional execution privileges.
DailyCVE Form
Platform: Microsoft Office Excel
Version: 2019, 2021, 365
Vulnerability: Out-of-bounds read
Severity: Critical
Date: 07/15/2025
Prediction: Patch by 08/10/2025
What Undercode Say
Analytics
import struct
malicious_xls = b"\x50\x4B\x03\x04" + b"\x90" 1000 Corrupted header
with open("exploit.xls", "wb") as f:
f.write(malicious_xls)
How Exploit
- Crafted Excel file triggers memory misalignment
- Reads adjacent process memory
- Dumps sensitive data via error logs
Protection from this CVE
- Disable macros in untrusted documents
- Apply Microsoft’s upcoming patch
- Use Office Protected View
Impact
- Local information disclosure
- Potential credential leakage
- Bypass of ASLR mitigations
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
