How severe is CVE-2025-21326?

CVE-2025-21326 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-2025-21326 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-21326?

CVE-2025-21326 primarily affects Microsoft Windows Server 2022 23h2. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-21326?

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-2025-21326 have an EU (EUVD) identifier?

Yes. CVE-2025-21326 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2391.

When was CVE-2025-21326 published?

CVE-2025-21326 was published on 2025-01-14 and last updated on 2026-06-17.

CVE-2025-21326

CVE-2025-21326 is a high-severity vulnerability in Microsoft Windows Server 2022 23h2 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-843.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-2391
Weakness: CWE-843
Affected product: Microsoft Windows Server 2022 23h2
Published: 2025-01-14
Last modified: 2026-06-17

Description

Internet Explorer Remote Code Execution Vulnerability

Frequently asked questions

What is CVE-2025-21326?: Internet Explorer Remote Code Execution Vulnerability
How severe is CVE-2025-21326?: CVE-2025-21326 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-2025-21326 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-21326?: CVE-2025-21326 primarily affects Microsoft Windows Server 2022 23h2. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-21326?: 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-2025-21326 have an EU (EUVD) identifier?: Yes. CVE-2025-21326 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-2391.
When was CVE-2025-21326 published?: CVE-2025-21326 was published on 2025-01-14 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21326

Affected products (2)

cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft Windows Server 2022 23h2

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Other CWE-843 vulnerabilities

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CVE-2023-22579 — Critical (CVSS 9.9): Due to improper parameter filtering in the sequalize js library, can a attacker peform injection.
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CVE-2026-43038 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: ipv6: icmp: clear skb2->cb[] in…
CVE-2025-70023 — Critical (CVSS 9.8): An issue pertaining to CWE-843: Access of Resource Using Incompatible Type was discovered in transloadit uppy v0.25.6.

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