How severe is CVE-2026-54117?

CVE-2026-54117 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-54117 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-54117?

CVE-2026-54117 primarily affects Microsoft Sql Server 2016. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-54117?

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

When was CVE-2026-54117 published?

CVE-2026-54117 was published on 2026-07-14 and last updated on 2026-08-20.

CVE-2026-54117

CVE-2026-54117 is a critical-severity vulnerability in Microsoft Sql Server 2016 with a CVSS 3.x base score of 9.8. 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Microsoft Sql Server 2016
Published: 2026-07-14
Last modified: 2026-08-20

Description

Deserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-54117?: Deserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-54117?: CVE-2026-54117 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-54117 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-54117?: CVE-2026-54117 primarily affects Microsoft Sql Server 2016. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-54117?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-54117 published?: CVE-2026-54117 was published on 2026-07-14 and last updated on 2026-08-20.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54117

Affected products (5)

cpe:2.3:a:microsoft:sql_server_2016:*:*:*:*:*:*: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:*
cpe:2.3:a:microsoft:sql_server_2025:*:*:*:*:*:*:x64:*

More vulnerabilities in Microsoft Sql Server 2016

CVE-2026-54118 — Critical (CVSS 9.8): Deserialization of untrusted data in SQL Server allows an unauthorized attacker to execute code over a network.
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