OnlyPatch
SQL Server

CVE-2023-21528 — Microsoft SQL Server Remote Code Execution Vulnerability

Important CVSS 7.8 EPSS 0.00393 2023-02 archive

Executive Summary

None

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Weakness CWE-122: Heap-based Buffer Overflow
Released Feb 14 2023
Last Updated Feb 14 2023
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00393 — 0.32382 percentile
NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.8

EPSS Score

0.00393
probability of exploitation in the next 30 days
0.32382 percentile - updated 2026-08-14
View on FIRST.org

Affected Products

17 affected products
Product KB Article Severity Impact Restart Required
Microsoft SQL Server 2008 for 32-bit Systems Service Pack 4 (QFE) 5020863 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2008 for x64-Based Systems Service Pack 4 (QFE) 5020863 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2008 R2 for 32-Bit Systems Service Pack 3 (QFE) 5021112 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2008 R2 for x64-Based Systems Service Pack 3 (QFE) 5021112 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2012 for 32-bit Systems Service Pack 4 (QFE) 5021123 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2012 for x64-based Systems Service Pack 4 (QFE) 5021123 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2014 Service Pack 3 for 32-bit Systems (CU 4) 5021045 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2014 Service Pack 3 for 32-bit Systems (GDR) 5021037 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2014 Service Pack 3 for x64-based Systems (CU 4) 5021045 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2014 Service Pack 3 for x64-based Systems (GDR) 5021037 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2016 for x64-based Systems Service Pack 3 (GDR) 5021129 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2016 for x64-based Systems Service Pack 3 Azure Connect Feature Pack 5021128 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2017 for x64-based Systems (CU 31) 5021126 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2017 for x64-based Systems (GDR) 5021127 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2019 for x64-based Systems (CU 18) 5021124 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2019 for x64-based Systems (GDR) 5021125 (Security Update) Important Remote Code Execution Maybe
Microsoft SQL Server 2022 for x64-based Systems (GDR) 5021522 (Security Update) Important Remote Code Execution Maybe

Patches

12 patches
Article Type Restart
5020863 Security Update Maybe
5021112 Security Update Maybe
5021123 Security Update Maybe
5021045 Security Update Maybe
5021037 Security Update Maybe
5021129 Security Update Maybe
5021128 Security Update Maybe
5021126 Security Update Maybe
5021127 Security Update Maybe
5021124 Security Update Maybe
5021125 Security Update Maybe
5021522 Security Update Maybe

Exploits & PoC

Detection Rules

Acknowledgments

Nicolas Joly of MSRC

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