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Reading: CVE-2024-21410: Microsoft Exchange Server Flaw Exploited in the Wild
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www.rivitmedia.com > Blog > Cyber Threats > Malware > CVE-2024-21410: Microsoft Exchange Server Flaw Exploited in the Wild
IT/Cybersecurity Best PracticesMalwareMicrosoft CVE Errors

CVE-2024-21410: Microsoft Exchange Server Flaw Exploited in the Wild

riviTMedia Research
Last updated: June 12, 2025 4:26 pm
riviTMedia Research
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CVE-2024-21410: Microsoft Exchange Server Flaw Exploited in the Wild
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In a recent revelation, Microsoft has confirmed the exploitation of a critical security vulnerability, CVE-2024-21410, in its Exchange Server. This flaw, identified with a severity score of 9.8 (CVSS), allows attackers to execute privilege escalation, potentially leading to the leakage of NTLM credentials. This article delves into the details of CVE-2024-21410, explores the actions and consequences of the malware, and offers insights into related threats and preventive measures.

Contents
Actions and Consequences of CVE-2024-21410Preventive Measures and Best PracticesConclusion

Actions and Consequences of CVE-2024-21410

  1. Privilege Escalation in Exchange Server: CVE-2024-21410 revolves around a privilege escalation issue within Microsoft Exchange Server. Attackers can exploit this flaw to leak NTLM credentials, primarily targeting clients like Outlook. The leaked credentials enable unauthorized access, allowing malicious actors to execute operations on the Exchange server on behalf of the victim.
  2. NTLM Relay Attacks: Successful exploitation facilitates the relay of a user’s leaked Net-NTLMv2 hash against a vulnerable Exchange Server. This enables the attacker to authenticate as the user, raising concerns about potential unauthorized access and data compromise.
  3. Extended Protection for Authentication (EPA): In response to the severity of the situation, Microsoft has categorized CVE-2024-21410 as “Exploitation Detected” and implemented Extended Protection for Authentication (EPA) by default with the Exchange Server 2019 Cumulative Update 14 (CU14) release. This aims to enhance security measures against further exploitation.
  4. Potential State-Affiliated Threat Actors: While specific details about the exploitation remain undisclosed, concerns have been raised about the involvement of state-affiliated hacking groups. APT28 (Forest Blizzard), known for exploiting vulnerabilities in Microsoft Outlook for NTLM relay attacks, is one of the groups potentially associated with the exploitation of CVE-2024-21410.
  5. Compounding Security Concerns: CVE-2024-21410 adds to existing security concerns following the discovery of two other actively exploited Windows vulnerabilities – CVE-2024-21351 and CVE-2024-21412. The latter, attributed to the Water Hydra APT group, allows bypassing Windows SmartScreen protections.

Preventive Measures and Best Practices

  1. Prompt Application of Security Updates: Microsoft strongly urges users to apply the latest security updates promptly. Timely updates are crucial for safeguarding systems and data from potential cyber threats, especially in the wake of actively exploited vulnerabilities like CVE-2024-21410.
  2. Vigilant Security Practices: Users should remain vigilant, practicing secure browsing habits and refraining from clicking on suspicious links or pop-ups. Awareness of potential threats and cautious online behavior are essential for maintaining cybersecurity.
  3. Regular System Patching: Regularly patching and updating systems, applications, and security software is fundamental to closing potential vulnerabilities and ensuring a robust defense against emerging cyber threats.

Conclusion

CVE-2024-21410 poses a significant threat to Microsoft Exchange Server users, necessitating immediate attention and action. This article emphasizes the importance of applying security updates promptly, understanding the potential risks, and adopting proactive security measures to safeguard against evolving cyber threats.

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