How severe is CVE-2025-55231?

CVE-2025-55231 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-55231 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-55231?

CVE-2025-55231 primarily affects Microsoft Windows Server 2012. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-55231?

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.

Does CVE-2025-55231 have an EU (EUVD) identifier?

Yes. CVE-2025-55231 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25494.

When was CVE-2025-55231 published?

CVE-2025-55231 was published on 2025-08-21 and last updated on 2026-06-17.

CVE-2025-55231

CVE-2025-55231 is a high-severity vulnerability in Microsoft Windows Server 2012 with a CVSS 3.x base score of 7.5. 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-362.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25494
Weakness: CWE-362
Affected product: Microsoft Windows Server 2012
Published: 2025-08-21
Last modified: 2026-06-17

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Storage allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2025-55231?: Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Storage allows an unauthorized attacker to execute code over a network.
How severe is CVE-2025-55231?: CVE-2025-55231 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-55231 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-55231?: CVE-2025-55231 primarily affects Microsoft Windows Server 2012. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-55231?: 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.
Does CVE-2025-55231 have an EU (EUVD) identifier?: Yes. CVE-2025-55231 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25494.
When was CVE-2025-55231 published?: CVE-2025-55231 was published on 2025-08-21 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55231

Affected products (5)

cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

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