Remote code execution via RRAS heap overflow
Published Jul 8, 2025 · Updated Feb 13, 2026
A heap-based buffer overflow in Microsoft Windows Server RRAS allows remote attackers to execute code through network traffic. Microsoft identifies the flaw only as a heap overflow in RRAS and does not disclose the input, parser, function, or faulty memory operation. Exploitation requires no privileges but requires a victim to open a malicious file, and success grants code execution in the RRAS process context.
Summary
What happened
A heap-based buffer overflow in Microsoft Windows Server RRAS allows remote attackers to execute code through network traffic. Microsoft identifies the flaw only as a heap overflow in RRAS and does not disclose the input, parser, function, or faulty memory operation. Exploitation requires no privileges but requires a victim to open a malicious file, and success grants code execution in the RRAS process context.
The record
- CVE
- CVE-2025-49663
- Published
- Jul 8, 2025
- Updated
- Feb 13, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-122, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 8, 2025CVE publishedPublication date reported by the CVE source.
- Feb 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.7558
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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