How severe is CVE-2023-21718?

CVE-2023-21718 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-21718 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-21718?

CVE-2023-21718 primarily affects Microsoft Sql Server. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-21718?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-21718 published?

CVE-2023-21718 was published on 2023-02-14 and last updated on 2026-06-17.

CVE-2023-21718

CVE-2023-21718 is a high-severity vulnerability in Microsoft Sql Server with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-191
Affected product: Microsoft Sql Server
Published: 2023-02-14
Last modified: 2026-06-17

Description

Microsoft ODBC Driver for SQL Server Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2023-21718?: Microsoft ODBC Driver for SQL Server Remote Code Execution Vulnerability
How severe is CVE-2023-21718?: CVE-2023-21718 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-21718 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-21718?: CVE-2023-21718 primarily affects Microsoft Sql Server. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-21718?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-21718 published?: CVE-2023-21718 was published on 2023-02-14 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21718

Affected products (8)

cpe:2.3:a:microsoft:sql_server:2008:sp4:*:*:*:*:*:*
cpe:2.3:a:microsoft:sql_server:2008_r2:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:sql_server:2012:sp4:*:*:*:*:*:*
cpe:2.3:a:microsoft:sql_server:2014:sp3:*:*:*:*:*:*
cpe:2.3:a:microsoft:sql_server:2016:sp3:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server:2017:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server:2019:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:sql_server:2022:*:*:*:*:*:x64:*

More vulnerabilities in Microsoft Sql Server

CVE-2002-1145 — Critical (CVSS 10.0): The xp_runwebtask stored procedure in the Web Tasks component of Microsoft SQL Server 7.0 and 2000, Microsoft Data…
CVE-2002-0721 — Critical (CVSS 10.0): Microsoft SQL Server 7.0 and 2000 installs with weak permissions for extended stored procedures that are associated…
CVE-2018-8273 — Critical (CVSS 9.8): A buffer overflow vulnerability exists in the Microsoft SQL Server that could allow remote code execution on an…
CVE-2009-3126 — Critical (CVSS 9.3): Integer overflow in GDI+ in Microsoft Internet Explorer 6 SP1, Windows XP SP2 and SP3, Office XP SP3, Office 2003 SP3,…
CVE-2009-2528 — Critical (CVSS 9.3): GDI+ in Microsoft Office XP SP3 does not properly handle malformed objects in Office Art Property Tables, which allows…
CVE-2009-2504 — Critical (CVSS 9.3): Multiple integer overflows in unspecified APIs in GDI+ in Microsoft .NET Framework 1.1 SP1, .NET Framework 2.0 SP1 and…

All CVEs affecting Microsoft Sql Server →

Other CWE-191 (Integer Underflow) vulnerabilities

CVE-2007-0063 — Critical (CVSS 10.0): Integer underflow in the DHCP server in EMC VMware Workstation before 5.5.5 Build 56455 and 6.x before 6.0.1 Build…
CVE-2026-53176 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: IB/isert: Reject login PDUs shorter than…
CVE-2026-37534 — Critical (CVSS 9.8): Integer underflow vulnerability in Open-SAE-J1939 thru commit b6caf884df46435e539b1ecbf92b6c29b345bdfe (2025-11-30) in…
CVE-2025-52471 — Critical (CVSS 9.8): ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. An integer underflow vulnerability has been…
CVE-2025-29909 — Critical (CVSS 9.8): CryptoLib provides a software-only solution using the CCSDS Space Data Link Security Protocol - Extended Procedures…
CVE-2024-47606 — Critical (CVSS 9.8): GStreamer is a library for constructing graphs of media-handling components. An integer underflow has been detected in…

Browse all CWE-191 (Integer Underflow) vulnerabilities →