A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests
Published May 12, 2017
7.5
HIGHCVSS 3.0
EPSS 16.91%
Description
A denial of service vulnerability exists when the ASP.NET Core fails to properly validate web requests. NOTE: Microsoft has not commented on third-party claims that the issue is that the TextEncoder.EncodeCore function in the System.Text.Encodings.Web package in ASP.NET Core Mvc before 1.0.4 and 1.1.x before 1.1.3 allows remote attackers to cause a denial of service by leveraging failure to properly calculate the length of 4-byte characters in the Unicode Non-Character range.
Affected products
-
- Version ASP.NET CoreStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft Corporation | ASP.NET Core | n/a |
|
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.1.0
- 1.1.1
- 1.1.2
- 4.1.1
- 4.3.1
- 4.0.1
- 4.3.0
- 4.0.0
- 4.3.0
- 4.0.0
- 4.3.0
- 4.0.0
- 4.3.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 16.91% (0.16911) | 96.97th | v5 (v2026.06.15) |
| Jun 15, 2026 | 16.91% (0.16911) | 96.65th | v5 (v2026.06.15) |
| Mar 30, 2025 | 11.12% (0.11122) | 92.84th | v4 (v2025.03.14) |
| Mar 29, 2025 | 32.22% (0.32221) | 95.04th | v4 (v2025.03.14) |
| Mar 17, 2025 | 11.12% (0.11122) | 92.94th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.35% (0.00349) | 72.63th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.35% (0.00349) | 70.99th | v3 (v2023.03.01) |
| May 8, 2023 | 0.35% (0.00349) | 67.51th | v3 (v2023.03.01) |
| Apr 22, 2023 | 0.32% (0.00317) | 65.93th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.45% (0.00450) | 71.16th | v3 (v2023.03.01) |
| Mar 6, 2023 | 25.09% (0.25090) | 96.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 25.09% (0.25090) | 95.43th | v2 (v2022.01.01) |
| Feb 3, 2022 | 13.80% (0.13796) | 89.38th | v1 |
| Jan 6, 2022 | 13.80% (0.13796) | 89.25th | v1 |
| Sep 1, 2021 | 13.80% (0.13796) | 96.74th | v1 |
| Apr 14, 2021 | 13.80% (0.13796) | 0.00th | v1 |
References (5)
- https://github.com/advisories/GHSA-6xh7-4v2w-36q6 Advisory
- https://github.com/aspnet/Announcements/issues/239 x_refsource_MISCTechnical DescriptionThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-0247
- https://technet.microsoft.com/en-us/library/security/4021279.aspx x_refsource_CONFIRMPatchVendor Advisory
- https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS x_refsource_MISCExploitThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-6xh7-4v2w-36q6 | Advisory | |
| https://github.com/aspnet/Announcements/issues/239 | x_refsource_MISCTechnical DescriptionThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-0247 | ||
| https://technet.microsoft.com/en-us/library/security/4021279.aspx | x_refsource_CONFIRMPatchVendor Advisory | |
| https://www.sidertia.com/Home/Community/Blog/2017/05/18/ASPNET-Core-Unicode-Non-Char-Encoding-DoS | x_refsource_MISCExploitThird Party Advisory |
Change history (0)
No recorded changes yet.