CVE-2025-53783 is a high-severity vulnerability affecting Microsoft Teams and associated products such as Dynamics 365 Guides and Dynamics 365 Remote Assist. This vulnerability allows unauthorized attackers to execute code remotely over a network due to a heap-based buffer overflow. With a CVSS score of 7.5, it poses a significant risk to organizations that utilize these technologies.
The risk to organizations includes potential unauthorized code execution, which could compromise sensitive data and system integrity. Given the nature of the vulnerability and its exploitation status, organizations should prioritize patching immediately to mitigate risks associated with this vulnerability.
This vulnerability has been classified as analyzed, and an exploit has been confirmed, indicating that attackers may leverage this vulnerability in real-world scenarios. The urgency for defenders is high due to the vulnerability's potential impact and the availability of exploit code.
To protect against CVE-2025-53783, organizations must ensure they are running the latest versions of affected products and apply security patches as soon as they become available.
Vulnerability Details
The official description of CVE-2025-53783 states that it is a heap-based buffer overflow in Microsoft Teams, allowing unauthorized attackers to execute code over a network. The affected products include Microsoft Teams, Dynamics 365 Guides, Dynamics 365 Remote Assist, Teams Panels, and Teams Phones.
The vulnerability has a CVSS score of 7.5, indicating a high severity level. The attack vector is network-based, and the attack complexity is assessed as high, requiring user interaction to exploit the vulnerability. The confidentiality, integrity, and availability impacts are all rated as high.
The vulnerability was published on August 12, 2025. It is classified under CWE-122, which pertains to improper validation of array indices.
Technical Analysis
The root cause of this vulnerability is a heap-based buffer overflow, which occurs when the application attempts to write more data to a buffer than it can hold. This can lead to memory corruption, allowing attackers to execute arbitrary code.
The attack vector is classified as network-based, meaning that an attacker can exploit this vulnerability remotely. The attack complexity is high, indicating that the attacker may need specific conditions to successfully exploit the vulnerability.
Privileges required for exploitation are none, which means that attackers do not need any special permissions to trigger the vulnerability. User interaction is required, as the user must engage with the vulnerable application to initiate the attack.
The impact on confidentiality, integrity, and availability is high, as successful exploitation can lead to unauthorized access to sensitive information, modification of data, and disruption of service.
Risk & Impact Analysis
Organizations using affected products face significant risks due to the potential for unauthorized code execution. The blast radius of this vulnerability could extend to all users of the affected applications, making it critical for organizations to assess their exposure.
The urgency for organizations to address this vulnerability is high. With a CVSS score of 7.5 and known exploit availability, there is a real threat of exploitation in the wild. Organizations should prioritize this vulnerability in their patch management cycles to reduce the risk of successful attacks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following products are affected by this vulnerability:
1. Dynamics 365 Guides (versions prior to 907.2505.29001.0)
2. Dynamics 365 Remote Assist (versions prior to 316.2505.28001)
3. Microsoft Teams for Android (versions prior to 1.0.0.2025102802)
4. Microsoft Teams for iOS (versions prior to 7.10.1)
5. Microsoft Teams for macOS (versions prior to 25122.1207.3700.1444)
6. Microsoft Teams for Desktop (versions prior to 25122.1415.3698.6812)
7. Teams Panels (versions prior to 1.0.97.2025102203)
8. Teams Phones (versions prior to 1.0.94.2025168802)
Mitigation & Remediation
Organizations must prioritize applying security patches provided by Microsoft to mitigate the risks associated with CVE-2025-53783. Ensure that all affected systems are updated to the latest versions.
If patches are unavailable, organizations should consider implementing network controls to restrict access to vulnerable applications and monitor for any anomalous behavior.
For additional security, consider engaging in regular penetration testing to identify and remediate potential vulnerabilities in your applications. Continuous security testing is essential for maintaining a robust security posture.
penetration testing can help identify such vulnerabilities before they can be exploited.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, including unusual patterns of network traffic associated with Microsoft Teams and related products.
Behavioral anomalies in user interactions with the applications should also be scrutinized for signs of unauthorized access or exploitation.
Establishing network signatures for known exploit patterns can enhance detection capabilities and facilitate rapid response to potential threats.
AppSecure Threat Intelligence Insight
CVE-2025-53783 highlights the ongoing challenges organizations face with buffer overflow vulnerabilities in widely-used applications. The presence of known exploits and public proof-of-concept code underscores the need for robust security measures and timely patch management.
Security teams should consider adopting a proactive security strategy that includes regular vulnerability assessments and continuous monitoring to stay ahead of emerging threats.
vulnerability management programs can help organizations mitigate risks effectively and respond swiftly to new vulnerabilities.
Regular penetration testing is essential for identifying and addressing vulnerabilities in a timely manner.
Cloud security assessments can also play a critical role in ensuring the security of applications deployed in cloud environments.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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