This vulnerability allows an elevation of privilege in Microsoft Edge (Chromium-based). The CVSS score of 7.4 classifies this as a high-severity vulnerability. Organizations are at risk of significant impacts should this vulnerability be exploited, as attackers may leverage it to gain elevated access within the affected systems. It is crucial for organizations to address this vulnerability promptly.
The urgency for defenders is high, considering the potential blast radius of this vulnerability. Organizations should prioritize patching immediately to prevent unauthorized access and mitigate the associated risks.
As of now, there is no public exploit confirmed, but the potential for exploitation remains, necessitating immediate attention from system administrators.
Security teams should be aware of the comprehensive nature of this vulnerability and prepare to implement necessary remediation steps.
Vulnerability Details
The CVE-2025-21399 vulnerability pertains to an elevation of privilege in Microsoft Edge (Chromium-based) updates. It has been assigned a CVSS score of 7.4, indicating a high severity level. This vulnerability is significant as it affects the confidentiality, integrity, and availability of the affected systems.
The vulnerability was published on January 17, 2025. The associated CWE classification is CWE-426, which relates to the issue of privilege escalation. The attack vector for this vulnerability is classified as local, while the attack complexity is high, indicating that exploitation requires a specific set of conditions.
Affected products include Microsoft Edge updates prior to version 1.3.195.43. Organizations should check their systems for compliance and apply necessary updates.
Technical Analysis
The root cause of this vulnerability stems from improper handling of updates in Microsoft Edge. Attackers could exploit this weakness by executing malicious code with elevated privileges, potentially leading to unauthorized access to sensitive data or system functions.
The attack vector is classified as local, meaning that an attacker would need physical access or a compromised local network to exploit this vulnerability. The complexity of the attack is high, requiring an attacker to possess specific knowledge or resources.
No user interaction is required for exploitation, and the attack does not change the scope of the affected system. The impacts on confidentiality, integrity, and availability are all classified as high, indicating severe potential consequences.
Risk & Impact Analysis
The real-world risk associated with this vulnerability includes potential unauthorized access to critical systems and data. Organizations utilizing Microsoft Edge are at increased risk of exploitation, particularly if they fail to apply the latest updates.
The vulnerability's high CVSS score reflects the significant blast radius and impact it could have if exploited. Security teams should prioritize remediation efforts based on this risk assessment.
Moreover, as the vulnerability has not been included in the KEV catalog, organizations should remain vigilant and monitor for any signs of exploitation or attempts to leverage this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include Microsoft Edge updates prior to version 1.3.195.43. Organizations should ensure they are running updated versions to mitigate this vulnerability.
Mitigation & Remediation
To mitigate this vulnerability, organizations should update Microsoft Edge to the latest version available, specifically ensuring they are above version 1.3.195.43. Regular security testing, including penetration testing, can also help identify vulnerabilities.
In cases where immediate updates cannot be applied, organizations should consider implementing configuration hardening, such as restricting access to sensitive areas of the system.
Monitoring for unusual behavior through logging and alerting can also provide early warnings of potential exploitation attempts.
Detection Guidance
Organizations should monitor logs for indicators of exploitation related to this vulnerability. Key elements to observe include unusual system modifications, unexpected access attempts, and any behavioral anomalies that deviate from normal patterns.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-21399 highlights a trend of increasing vulnerabilities in widely used applications such as web browsers. Security teams should recognize the importance of proactive vulnerability management and adopt a vulnerability management program to ensure the security of their environments.
Additionally, teams should stay informed about evolving threats and consider leveraging penetration testing methodologies as part of their overall security strategy.
The CVE-2025-21399 vulnerability serves as a reminder of the critical need for continuous security assessments and the implementation of robust security controls.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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