CVE-2024-51501Public exploitNetwork attack vector

SSRF via unvalidated CRLF header values

Published Nov 4, 2024 · Updated Nov 8, 2024

CRLF injection in ReactiveUI Refit before 7.2.22 allows attackers to trigger SSRF through user-controlled HTTP header values. SetHeader passes attribute-derived names and values to HttpHeaders.TryAddWithoutValidation without removing carriage returns or line feeds. Exposure requires a host application to place attacker-controlled data in Header, HeaderCollection, or Authorize values over HTTP/1.1, enabling request splitting or additional outbound requests.

CVSS severity10.0
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CRLF injection in ReactiveUI Refit before 7.2.22 allows attackers to trigger SSRF through user-controlled HTTP header values. SetHeader passes attribute-derived names and values to HttpHeaders.TryAddWithoutValidation without removing carriage returns or line feeds. Exposure requires a host application to place attacker-controlled data in Header, HeaderCollection, or Authorize values over HTTP/1.1, enabling request splitting or additional outbound requests.

The record

CVE
CVE-2024-51501
Published
Nov 4, 2024
Updated
Nov 8, 2024
Vendor
ReactiveUI
Product
Refit
Classifications
CWE-93
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <8.0.0
  2. Affected versionversion=< 7.2.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ReactiveUI · Refitversion=0 <8.0.0; version=< 7.2.22

Published CVSS scores

10.0GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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