The article discusses the critical Microsoft Outlook vulnerability CVE-2025-21298, which allows remote code execution (RCE) through specially crafted emails. This zero-click flaw has a CVSS score of 9.8 and poses significant risks to email security. Immediate action is recommended, including applying patches and utilizing detection tools. Affected: Microsoft Outlook, Windows devices
Keypoints :
- Disclosure of CVE-2025-21298, a critical vulnerability in Microsoft Outlook.
- The vulnerability allows remote code execution (RCE) via specially crafted emails.
- It has a CVSS severity rating of 9.8, indicating a high level of risk.
- In January 2025, over 2,560 vulnerabilities were identified, marking a high-risk period.
- Detection tools, such as a free Sigma rule from SOC Prime, are available to identify exploitation attempts.
- Exploitation can occur by opening or previewing malicious RTF documents sent via email.
- Mitigation measures include applying patches and using workarounds for opening RTF files.
- Organizations are urged to act immediately to protect against potential exploitation.
MITRE Techniques :
- Exploitation for Client Execution (T1203): Attackers exploit the vulnerability by sending malicious emails that trigger RCE.
- Phishing: Spearphishing Attachment (T1566.001): Malicious RTF files are used in phishing campaigns to lure victims.
Full Story: https://socprime.com/blog/cve-2025-21298-detection/
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