CVE-2017-0256

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 4.3%, top 11% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 4%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
87.9%
KEV
Not listed

Published

May 12, 2017

Last Modified

May 13, 2026

References (2)

Affected Packages

(19 across 1 ecosystem)
NuGet(19)
PackageVulnerable rangeFixed inDependents
Microsoft.AspNetCore.Mvc1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Abstractions1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.ApiExplorer1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Core1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Cors1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.DataAnnotations1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Formatters.Json1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Formatters.Xml1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Localization1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Razor1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.Razor.Host1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.TagHelpers1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.ViewFeatures1.1.0, 1.1.1, 1.1.21.1.3—
Microsoft.AspNetCore.Mvc.WebApiCompatShim1.1.0, 1.1.1, 1.1.21.1.3—
System.Net.Http4.3.14.3.2—
System.Net.Http.WinHttpHandler4.3.04.3.1—
System.Net.Security4.3.04.3.1—
System.Net.WebSockets.Client4.3.04.3.1—
System.Text.Encodings.Web4.3.04.3.1—

Data Freshness Timeline

(refreshed 10× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 05:43 UTCEPSS rescore
  2. 2026-07-12 05:43 UTCEPSS rescore
  3. 2026-07-11 08:24 UTCEPSS rescore
  4. 2026-07-09 19:06 UTCEPSS rescore
  5. 2026-07-08 15:10 UTCEPSS rescore
  6. 2026-07-07 13:42 UTCEPSS rescore
  7. 2026-07-06 16:24 UTCEPSS rescore
  8. 2026-07-06 16:24 UTCEPSS rescore
  9. 2026-07-06 02:20 UTCEPSS rescore
  10. 2026-07-06 02:20 UTCEPSS rescore
  11. 2026-07-05 02:27 UTCEPSS rescore
  12. 2026-07-04 06:28 UTCEPSS rescore
  13. 2026-07-01 15:02 UTCEPSS rescore
  14. 2026-06-30 23:19 UTCEPSS rescore
  15. 2026-06-30 23:19 UTCEPSS rescore
  16. 2026-06-29 14:03 UTCEPSS rescore
  17. 2026-06-28 14:04 UTCEPSS rescore
  18. 2026-06-28 04:53 UTCEPSS rescore
  19. 2026-06-27 03:05 UTCEPSS rescore
  20. 2026-06-25 13:47 UTCEPSS rescore
  21. 2026-06-24 14:02 UTCEPSS rescore
  22. 2026-06-23 21:30 UTCEPSS rescore
  23. 2026-06-22 14:23 UTCEPSS rescore
  24. 2026-06-21 14:54 UTCEPSS rescore
  25. 2026-06-21 14:54 UTCEPSS rescore
Show 48 more
  1. 2026-06-21 01:57 UTCEPSS rescore
  2. 2026-06-21 01:57 UTCEPSS rescore
  3. 2026-06-19 19:23 UTCEPSS rescore
  4. 2026-06-19 19:23 UTCEPSS rescore
  5. 2026-06-18 17:50 UTCEPSS rescore
  6. 2026-06-18 17:50 UTCEPSS rescore
  7. 2026-06-17 17:50 UTCEPSS rescore
  8. 2026-06-17 17:50 UTCEPSS rescore
  9. 2026-06-16 17:50 UTCEPSS rescore
  10. 2026-06-15 17:45 UTCEPSS rescore
  11. 2026-06-13 22:57 UTCEPSS rescore
  12. 2026-06-13 22:57 UTCEPSS rescore
  13. 2026-06-12 23:09 UTCEPSS rescore
  14. 2026-06-11 13:57 UTCEPSS rescore
  15. 2026-06-08 14:14 UTCEPSS rescore
  16. 2026-06-07 15:22 UTCEPSS rescore
  17. 2026-06-07 15:22 UTCEPSS rescore
  18. 2026-06-06 13:45 UTCEPSS rescore
  19. 2026-06-06 13:45 UTCEPSS rescore
  20. 2026-06-05 22:44 UTCEPSS rescore
  21. 2026-06-05 06:08 UTCEPSS rescore
  22. 2026-06-05 06:08 UTCEPSS rescore
  23. 2026-06-04 13:10 UTCEPSS rescore
  24. 2026-06-04 13:10 UTCEPSS rescore
  25. 2026-06-02 20:10 UTCEPSS rescore
  26. 2026-06-01 13:49 UTCEPSS rescore
  27. 2026-06-01 13:49 UTCEPSS rescore
  28. 2026-05-31 22:28 UTCEPSS rescore
  29. 2026-05-31 22:28 UTCEPSS rescore
  30. 2026-05-31 00:14 UTCEPSS rescore
  31. 2026-05-29 13:41 UTCEPSS rescore
  32. 2026-05-28 13:42 UTCEPSS rescore
  33. 2026-05-28 13:42 UTCEPSS rescore
  34. 2026-05-27 13:38 UTCEPSS rescore
  35. 2026-05-27 13:38 UTCEPSS rescore
  36. 2026-05-26 07:17 UTCEPSS rescore
  37. 2026-05-24 16:44 UTCEPSS rescore
  38. 2026-05-23 00:10 UTCEG score recompute
  39. 2026-05-22 21:15 UTCEPSS rescore
  40. 2026-05-22 13:28 UTCEG score recompute
  41. 2026-05-20 22:37 UTCEPSS rescore
  42. 2026-05-20 22:37 UTCEPSS rescore
  43. 2026-05-20 22:37 UTCEPSS rescore
  44. 2026-05-20 11:21 UTCEPSS rescore
  45. 2026-05-20 11:21 UTCEPSS rescore
  46. 2026-05-18 21:30 UTCEPSS rescore
  47. 2026-05-18 21:30 UTCEPSS rescore
  48. 2026-05-18 21:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2017-0256?
CVE-2017-0256 is a medium vulnerability published on May 12, 2017. A spoofing vulnerability exists when the ASP.NET Core fails to properly sanitize web requests.
When was CVE-2017-0256 disclosed?
CVE-2017-0256 was first published in the National Vulnerability Database on May 12, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-0256 actively exploited?
CVE-2017-0256 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-0256?
CVE-2017-0256 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2017-0256?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-0256, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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