CVE-2025-0825

cpp-httplib version v0.17.3 through v0.18.3 fails to filter CRLF characters ("\r\n") when those are prefixed with a null byte. This enables attackers to exploit CRLF injection that could further lead to HTTP Response Splitting, XSS, and more.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://advisory.checkmarx.net/advisory/CVE-2025-0825/	Exploit Third Party Advisory
https://github.com/yhirose/cpp-httplib/commit/9c36aae4b73e2b6e493f4133e4173103c9266289	Patch

Configurations

Configuration 1 (hide)

cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*

History

04 Aug 2025, 15:06

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.3
References	~~() https://advisory.checkmarx.net/advisory/CVE-2025-0825/ -~~	() https://advisory.checkmarx.net/advisory/CVE-2025-0825/ - Exploit, Third Party Advisory
References	~~() https://github.com/yhirose/cpp-httplib/commit/9c36aae4b73e2b6e493f4133e4173103c9266289 -~~	() https://github.com/yhirose/cpp-httplib/commit/9c36aae4b73e2b6e493f4133e4173103c9266289 - Patch
CPE		cpe:2.3:a:yhirose:cpp-httplib::::::::
First Time		Yhirose Yhirose cpp-httplib

23 May 2025, 13:15

Type	Values Removed	Values Added
Summary		(es) La versión v0.17.3 a v0.18.3 de cpp-httplib no filtra los caracteres CRLF ("\r\n") cuando tienen como prefijo un byte nulo. Esto permite a los atacantes aprovechar la inyección CRLF que podría conducir a la división de la respuesta HTTP, XSS y más.
References		() https://advisory.checkmarx.net/advisory/CVE-2025-0825/ -

04 Feb 2025, 15:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-02-04 15:15

Updated : 2025-08-04 15:06

NVD link : CVE-2025-0825

Mitre link : CVE-2025-0825

CVE.ORG link : CVE-2025-0825

JSON object : View

Products Affected

yhirose

cpp-httplib

CWE

CWE-113

Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

{"id": "CVE-2025-0825", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2025-02-04T15:15:19.420", "references": [{"url": "https://advisory.checkmarx.net/advisory/CVE-2025-0825/", "tags": ["Exploit", "Third Party Advisory"], "source": "596c5446-0ce5-4ba2-aa66-48b3b757a647"}, {"url": "https://github.com/yhirose/cpp-httplib/commit/9c36aae4b73e2b6e493f4133e4173103c9266289", "tags": ["Patch"], "source": "596c5446-0ce5-4ba2-aa66-48b3b757a647"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "596c5446-0ce5-4ba2-aa66-48b3b757a647", "description": [{"lang": "en", "value": "CWE-113"}]}], "descriptions": [{"lang": "en", "value": "cpp-httplib version v0.17.3 through v0.18.3 fails to filter CRLF characters (\"\\r\\n\") when those are prefixed with a null byte. This enables attackers to exploit CRLF injection that could further lead to HTTP Response Splitting, XSS, and more."}, {"lang": "es", "value": "La versi\u00f3n v0.17.3 a v0.18.3 de cpp-httplib no filtra los caracteres CRLF (\"\\r\\n\") cuando tienen como prefijo un byte nulo. Esto permite a los atacantes aprovechar la inyecci\u00f3n CRLF que podr\u00eda conducir a la divisi\u00f3n de la respuesta HTTP, XSS y m\u00e1s."}], "lastModified": "2025-08-04T15:06:24.727", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D340D10D-0A48-408A-B0F2-B432EF76F5A5", "versionEndExcluding": "0.18.4", "versionStartIncluding": "0.17.3"}], "operator": "OR"}]}], "sourceIdentifier": "596c5446-0ce5-4ba2-aa66-48b3b757a647"}