CVE-2007-0671 in Office
Summary
by MITRE
Unspecified vulnerability in Microsoft Excel 2000, XP, 2003, and 2004 for Mac, and possibly other Office products, allows remote user-assisted attackers to execute arbitrary code via unknown attack vectors, as demonstrated by Exploit-MSExcel.h in targeted zero-day attacks.
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Analysis
by VulDB Data Team • 04/22/2026
This vulnerability represents a critical remote code execution flaw affecting multiple versions of Microsoft Excel including Excel 2000, XP, 2003, and 2004 for Mac operating systems. The unspecified nature of the vulnerability indicates that Microsoft did not provide detailed technical information about the specific flaw during the initial disclosure, which is common in zero-day exploits where attackers leverage unknown weaknesses before vendors can develop patches. The vulnerability specifically allows remote user-assisted attackers to execute arbitrary code, meaning that an attacker could potentially gain complete control over a victim's system through malicious Excel files. This type of attack vector is particularly dangerous because it can be initiated remotely without requiring the user to perform any special actions beyond opening a malicious file, though the user-assisted aspect suggests some level of user interaction may be required for successful exploitation.
The technical nature of this vulnerability aligns with common software exploitation patterns found in Microsoft Office applications, where memory corruption issues frequently provide attackers with opportunities to execute malicious code. Based on the description and similar historical vulnerabilities, this likely involves buffer overflow conditions, heap corruption, or other memory management flaws that occur when Excel processes malformed data within Excel files. The fact that this vulnerability was demonstrated through Exploit-MSExcel.h indicates it was part of a targeted zero-day attack campaign, suggesting sophisticated exploitation techniques that were specifically designed to bypass existing security measures. Such exploits typically leverage the complex parsing logic of spreadsheet applications where various file formats are processed and converted into executable code within memory.
The operational impact of this vulnerability extends beyond simple remote code execution, as it represents a significant threat to enterprise security environments where Microsoft Office applications are widely deployed. Organizations using affected Excel versions face substantial risk of compromise, with potential for data theft, system takeover, and lateral movement within networks. The vulnerability affects multiple versions across different platforms, making it particularly challenging for security teams to remediate comprehensively, as different operating systems and application versions may require separate patching strategies. Attackers leveraging this vulnerability could establish persistent backdoors, exfiltrate sensitive corporate data, or use compromised systems as launch points for broader network attacks, making this a critical concern for enterprise security operations.
Mitigation strategies for this vulnerability should include immediate deployment of Microsoft security patches and updates, which would address the underlying memory corruption issues. Organizations should implement strict file validation policies, particularly for Excel files received from external sources, and consider deploying application whitelisting solutions to prevent execution of unauthorized Office applications. Network-based security controls such as intrusion detection systems and email filtering solutions should be configured to identify and block suspicious Excel file attachments. The vulnerability's classification aligns with CWE-119, which covers "Improper Access to Memory Location" and represents a fundamental weakness in memory management that allows attackers to execute arbitrary code. From an ATT&CK framework perspective, this vulnerability maps to techniques involving execution through Office applications and remote code execution, potentially leveraging privilege escalation capabilities if successful exploitation occurs. Security teams should also conduct regular vulnerability assessments and penetration testing to identify similar weaknesses in other Microsoft Office applications and related software components that may present similar attack surfaces.