Ritlabs TinyWeb Server Request crlf injection

published 2024-05-22 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-46436

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits: 0; none known

A security vulnerability has been detected in Ritlabs TinyWeb Server 1.94. This vulnerability affects unknown code of the component Request Handler. The manipulation with the input %0D%0A leads to crlf injection. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 1.99 is able to resolve this issue. The identifier of the patch is d49c3da6a97e950975b18626878f3ee1f082358e. It is suggested to upgrade the affected component. The vendor was contacted early about this disclosure but did not respond in any way.

Patch / fix

fixed in 1 links 3

Ritlabs TinyWeb Server 1.99

github.com/maximmasiutin/TinyWeb@d49c3da commit
github.com/maximmasiutin/TinyWeb/releases/tag/v1.99 release
vuldb.com/?id.265830 advisory

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-05-22)

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/DMCERTCE/CRLF_Tiny referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.9	CVSS: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
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
CNA	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
CNA	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C
CNA	4.0	5.5	CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

Ritlabs TinyWeb Server
ritlabs tinyweb

Classification

Weakness

CWE-93 Improper Neutralization of CRLF Sequences
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

vuldb.com /?id.265830
vdb-entry, technical-description, mitigation, patch, third-party-advisory
github.com /maximmasiutin/TinyWeb/commit/d49c3da6a97e950975b18626878f3ee1f082358e
patch
github.com /maximmasiutin/TinyWeb/releases/tag/v1.99
patch
github.com /DMCERTCE/CRLF_Tiny
exploit
vuldb.com /?ctiid.265830
signature, permissions-required, vdb-entry
vuldb.com /?submit.333059
third-party-advisory, vdb-entry
masiutin.net /tinyweb-cve-2024-5193.html
mitigation

Sources

CVE List CVE-2024-5193
NVD CVE-2024-5193

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary