CVE-2021-26701
CVE-2021-26701 is a high-severity vulnerability in Microsoft .net with a CVSS 3.x base score of 8.1. Its EPSS exploit-prediction score of 30% places it in the 98th percentile, indicating an elevated likelihood of exploitation.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- CVSS v2: 7.5
- EPSS exploit prediction: 30% (98th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Microsoft .net
- Published:
- Last modified:
Description
.NET Core Remote Code Execution Vulnerability
Frequently asked questions
- What is CVE-2021-26701?
- .NET Core Remote Code Execution Vulnerability
- How severe is CVE-2021-26701?
- CVE-2021-26701 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-26701 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 30% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-26701?
- CVE-2021-26701 primarily affects Microsoft .net. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-26701?
- 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-2021-26701 published?
- CVE-2021-26701 was published on 2021-02-25 and last updated on 2026-06-17.
References
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S2AZOUKMCHT2WBHR7MYDTYXWOBHZW5P5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TW3ZSJTTMZAFKGW7NJWTVVFZUYYU2SJZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBOSSX7U6BSHV5RI74FCOW4ITJ5RRJR5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WA5WQJVHUL5C4XMJTLY3C67R4WP35EF4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XPUKFHIGP5YNJRRFWKDJ2XRS4WTFJNNK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YLFATXASXW4OV2ZBSRP4G55HJH73QPBP/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26701
Affected products (9)
- cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:powershell_core:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:powershell_core:7.1:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*
- cpe:2.3:a:microsoft:visual_studio_2019:-:*:*:*:*:macos:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
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