CVE-2025-21171
CVE-2025-21171 is a high-severity vulnerability in Microsoft .net 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-122.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 2% (73rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-0075
- Weakness: CWE-122
- Affected product: Microsoft .net
- Published:
- Last modified:
Description
.NET Remote Code Execution Vulnerability
Frequently asked questions
- What is CVE-2025-21171?
- .NET Remote Code Execution Vulnerability
- How severe is CVE-2025-21171?
- CVE-2025-21171 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-2025-21171 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-21171?
- CVE-2025-21171 primarily affects Microsoft .net. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2025-21171?
- 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-2025-21171 have an EU (EUVD) identifier?
- Yes. CVE-2025-21171 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-0075.
- When was CVE-2025-21171 published?
- CVE-2025-21171 was published on 2025-01-14 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:a:microsoft:.net:9.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:powershell:7.5:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*
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