Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker could exploit this vulnerability by submitting a specially crafted payload to an affected service that deserializes untrusted data. Successful exploitation could allow the attacker to execute code on the target system.
Security updates
15.0.2190.7 — https://support.microsoft.com/help/5122773
16.0.1200.5 — https://support.microsoft.com/help/5122771
17.0.1135.8 — https://support.microsoft.com/help/5122770
15.0.4490.9 — https://support.microsoft.com/help/5122772
17.0.4085.5 — https://support.microsoft.com/help/5122769
16.0.4275.2 — https://support.microsoft.com/help/5122768
Vulnerabilities 1
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High 8.8
Microsoft SQL Server Remote Code Execution Vulnerability
Deserialization of untrusted data in SQL Server allows an authorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-77484 Microsoft SQL Server Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77484
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss