VDB
CVE-2021-26701
CVE-2021-26701
PUBLISHED
CVSS 8.1 HIGH
.NET Core Remote Code Execution Vulnerability
Reported by microsoft · Published February 25, 2021
System.Text.Encodings.Web is fixed in 5.0.1, 4.7.2 and 4.5.1 (NuGet)
.NET Core Remote Code Execution Vulnerability
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| System.Text.Encodings.Web | NuGet | 5.0.1, 4.7.2, 4.5.1 |
| dotnet-sdk | Arch Linux | 5.0.4.sdk104-1 |
| dotnet-runtime | Arch Linux | 5.0.4.sdk104-1 |
| dotnet | Bitnami | 5.0.4 |
| dotnet-sdk | Bitnami | 5.0.4 |
| PowerShell Core 7.0 | Microsoft | publication |
| .NET Core 3.1 | Microsoft | publication |
| .net_core | microsoft | 3.1.15, 2.1.28 |
| Microsoft Visual Studio 2019 version 16.8 (includes 16.0 - 16.7) | Microsoft | publication |
| Visual Studio 2019 for Mac | Microsoft | publication |
| PowerShell Core 7.1 | Microsoft | publication |
| .NET Core 2.1 | Microsoft | publication |
9 more packages have a fixed version. See every fix in Lookup.
Risk scores
CVSS 3.1
8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | .NET Core 2.1 | 2.1 |
| Microsoft | .NET Core 3.1 | 3.1 |
| Microsoft | .NET 5.0 | 5.0.0 |
| Microsoft | Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) | 16.0 |
| Microsoft | Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8) | 15.9.0 |
| Microsoft | Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6) | 16.0.0 |
| Microsoft | Visual Studio 2019 for Mac | 8.0.0 |
| Microsoft | Microsoft Visual Studio 2019 version 16.8 (includes 16.0 - 16.7) | 16.0 |
| Microsoft | Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) | 15.0.0 |
| Microsoft | PowerShell Core 7.1 | 7.1.0 |
| Microsoft | PowerShell Core 7.0 | 7.0.0 |
| Microsoft | PowerShell Core 7.0 | 7.0.0 |
| Microsoft | .NET Core 3.1 | 3.1 |
| Microsoft | Microsoft Visual Studio 2019 version 16.8 (includes 16.0 - 16.7) | 16.0 |
| Microsoft | Visual Studio 2019 for Mac | 8.0.0 |
| Microsoft | .NET Core 2.1 | 2.1 |
| Microsoft | Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8) | 15.0.0 |
| Microsoft | Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3) | 16.0 |
| NuGet | System.Text.Encodings.Web | 5.0.0, 4.0.0, 4.6.0 |
| Microsoft | .NET 5.0 | 5.0.0 |
…and 5 more
Timeline
- Feb 9, 2021 CVE Published
- Apr 14, 2021 EPSS Score (30 in total, the first dated here)
- Nov 14, 2024 PoC Published
- Nov 21, 2024 CVE Updated
- Mar 17, 2026 Security Advisory (11 in total, the first dated here)
- Mar 30, 2026 Distribution Patch (6 in total, the first dated here)
- Aug 7, 2026 Coalition ESS Score
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2021-26701
vulnetix vdb fixes CVE-2021-26701Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2021-26701/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- x_refsource_MISC
- FEDORA-2021-e2d218afe6 vendor-advisoryx_refsource_FEDORA
- FEDORA-2021-904d0bd496 vendor-advisoryx_refsource_FEDORA
- FEDORA-2021-1b22f31541 vendor-advisoryx_refsource_FEDORA
- FEDORA-2021-138728e59b vendor-advisoryx_refsource_FEDORA
- FEDORA-2021-3da33cdc80 vendor-advisoryx_refsource_FEDORA
- FEDORA-2021-265a3c7cb9 vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2021-26701 advisory
- https://github.com/dotnet/announcements/issues/178 url
- https://github.com/advisories/GHSA-ghhp-997w-qr28 advisory