CVE-2024-5193Public exploitNetwork attack vector

Unauthenticated HTTP header injection via decoded redirect path

Published May 22, 2024 · Updated Jan 5, 2026

CRLF injection in Ritlabs TinyWeb Server 1.94 allows remote attackers to inject HTTP response headers through crafted request URLs. UnpackPchars decodes percent-encoded CR and LF bytes into URIPath, and ReturnNewLocation copies that path into a 302 Location header without filtering. No authentication is required; the request must trigger a redirect, enabling response splitting, attacker-chosen headers, and log spoofing.

CVSS severity6.9
Medium
EPSS probability0.66%
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 Ritlabs TinyWeb Server 1.94 allows remote attackers to inject HTTP response headers through crafted request URLs. UnpackPchars decodes percent-encoded CR and LF bytes into URIPath, and ReturnNewLocation copies that path into a 302 Location header without filtering. No authentication is required; the request must trigger a redirect, enabling response splitting, attacker-chosen headers, and log spoofing.

The record

CVE
CVE-2024-5193
Published
May 22, 2024
Updated
Jan 5, 2026
Vendor
Ritlabs
Product
TinyWeb Server
Classifications
CWE-74, CWE-93, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Jan 5, 2026Record 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=1.94

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ritlabs · TinyWeb Serverversion=1.94

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
5.3TinyWeb maintainerCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.9TinyWeb maintainerCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
T1190Exploit Public-Facing Application

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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