CVE-2024-51501

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 71% 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
Elevated
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 10.0Exploit: NoneExposed: 0

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

Refit is an automatic type-safe REST library for .NET Core, Xamarin and .NET The various header-related Refit attributes (Header, HeaderCollection and Authorize) are vulnerable to CRLF injection. The way HTTP headers are added to a request is via the HttpHeaders.TryAddWithoutValidation method. This method does not check for CRLF characters in the header value. This means that any headers added to a refit request are vulnerable to CRLF-injection. In general, CRLF-injection into a HTTP header (when using HTTP/1.1) means that one can inject additional HTTP headers or smuggle whole HTTP requests. If an application using the Refit library passes a user-controllable value through to a header, then that application becomes vulnerable to CRLF-injection. This is not necessarily a security issue for a command line application like the one above, but if such code were present in a web application then it becomes vulnerable to request splitting (as shown in the PoC) and thus Server Side Request Forgery. Strictly speaking this is a potential vulnerability in applications using Refit and not in Refit itself. This issue has been addressed in release versions 7.2.22 and 8.0.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

CVSS v3
10.0
EG Score
10.0(medium)
EPSS
41.8%
KEV
Not listed

Published

November 4, 2024

Last Modified

April 15, 2026

Advisory Details (2)

Auto-updated Jul 17, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

CRLF injection in Refit's [Header], [HeaderCollection] and [Authorize] attributes · Advisory · reactiveui/refit · GitHub

https://github.com/reactiveui/refit/security/advisories/GHSA-3hxg-fxwm-8gf7
generic

refit/Refit/RequestBuilderImplementation.cs at 258a771f44417c6e48e103ac921fe4786f3c2a1e · reactiveui/refit · GitHub

https://github.com/reactiveui/refit/blob/258a771f44417c6e48e103ac921fe4786f3c2a1e/Refit/RequestBuilderImplementation.cs#L1328

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
Refit1.0.0 ... 7.2.1 (64 versions)7.2.22—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 43× 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.

Showing the most recent 100 of 111 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
  2. 2026-07-22 14:07 UTCEPSS rescore
  3. 2026-07-21 15:23 UTCEPSS rescore
  4. 2026-07-20 17:06 UTCEPSS rescore
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  11. 2026-07-16 17:02 UTCEPSS rescore
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  14. 2026-07-15 01:59 UTCEPSS rescore
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  16. 2026-07-14 08:55 UTCOSV refresh
  17. 2026-07-13 22:29 UTCEPSS rescore
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  1. 2026-07-06 16:26 UTCEPSS rescore
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  5. 2026-07-01 15:05 UTCEPSS rescore
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  8. 2026-06-28 14:07 UTCEPSS rescore
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  11. 2026-06-27 03:07 UTCEPSS rescore
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  13. 2026-06-26 09:39 UTCOSV refresh
  14. 2026-06-25 13:49 UTCEPSS rescore
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  21. 2026-06-21 14:56 UTCEPSS rescore
  22. 2026-06-21 01:59 UTCEPSS rescore
  23. 2026-06-21 01:58 UTCEPSS rescore
  24. 2026-06-19 19:25 UTCEPSS rescore
  25. 2026-06-18 17:52 UTCEPSS rescore
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  27. 2026-06-17 17:52 UTCEPSS rescore
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  39. 2026-06-10 22:18 UTCEPSS rescore
  40. 2026-06-10 13:21 UTCEPSS rescore
  41. 2026-06-08 16:41 UTCEG score recompute▲ 10.00
  42. 2026-06-08 14:16 UTCEPSS rescore
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  44. 2026-06-07 15:24 UTCEPSS rescore
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  46. 2026-06-06 13:46 UTCEPSS rescore
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  48. 2026-06-05 22:46 UTCEPSS rescore
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  50. 2026-06-05 06:09 UTCEPSS rescore
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  52. 2026-06-04 13:11 UTCEPSS rescore
  53. 2026-06-04 13:11 UTCEPSS rescore
  54. 2026-06-04 08:39 UTCOSV refresh
  55. 2026-06-02 20:12 UTCEPSS rescore
  56. 2026-06-01 13:51 UTCEPSS rescore
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  58. 2026-05-31 22:30 UTCEPSS rescore
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  73. 2026-05-22 21:16 UTCEPSS rescore
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  75. 2026-05-22 21:16 UTCEPSS rescore

Frequently asked(5)

What is CVE-2024-51501?
CVE-2024-51501 is a critical vulnerability published on November 4, 2024. Refit is an automatic type-safe REST library for .NET Core, Xamarin and .NET The various header-related Refit attributes (Header, HeaderCollection and Authorize) are vulnerable to CRLF injection. The way HTTP headers are added to a request is via the HttpHeaders.TryAddWithoutValidation method. This…
When was CVE-2024-51501 disclosed?
CVE-2024-51501 was first published in the National Vulnerability Database on November 4, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-51501 actively exploited?
CVE-2024-51501 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 41.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-51501?
CVE-2024-51501 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2024-51501?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-51501, 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.

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