CVE-2021-4097 - Vulnerability Details - OpenCVE

phpservermon is vulnerable to Improper Neutralization of CRLF Sequences

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction Required

Access Vector Network

Access Complexity Medium

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

The EPSS score is 0.0024.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

phpservermon

phpservermon/phpservermon

affected

Version	Status	Constraints
`unspecified`	affected	< 3.6.0

Configuration 1 [-]

cpe:2.3:a:phpservermonitor:php_server_monitor:*:*:*:*:*:*:*:*

No data.

No data.

Subscriptions

Vendors	Products
Phpservermonitor Subscribe	Php Server Monitor Subscribe

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-2485	phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
Github GHSA	GHSA-8qv8-fq5w-p966	phpservermon is vulnerable to CRLF Injection

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4
https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43

History

Tue, 24 Feb 2026 19:00:00 +0000

Type	Values Removed	Values Added
Title	CRLF Injection in phpservermon/phpservermon	CRLF Injection in phpservermon/phpservermon

MITRE

Status: PUBLISHED

Assigner: @huntrdev

Published: 2021-12-11T23:30:10.000Z

Updated: 2024-08-03T17:16:04.220Z

Reserved: 2021-12-10T00:00:00.000Z

Link: CVE-2021-4097

Vulnrichment

No data.

NVD

Status : Modified

Published: 2021-12-12T00:15:07.743

Modified: 2024-11-21T06:36:53.713

Link: CVE-2021-4097

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-93

{"containers": {"cna": {"affected": [{"product": "phpservermon/phpservermon", "vendor": "phpservermon", "versions": [{"lessThan": "3.6.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "phpservermon is vulnerable to Improper Neutralization of CRLF Sequences"}], "metrics": [{"cvssV3_0": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "version": "3.0"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-93", "description": "CWE-93 Improper Neutralization of CRLF Sequences", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-12-11T23:30:10.000Z", "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntrdev"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4"}], "source": {"advisory": "d617ced7-be06-4e34-9db0-63d45c003a43", "discovery": "EXTERNAL"}, "title": "CRLF Injection in phpservermon/phpservermon", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@huntr.dev", "ID": "CVE-2021-4097", "STATE": "PUBLIC", "TITLE": "CRLF Injection in phpservermon/phpservermon"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "phpservermon/phpservermon", "version": {"version_data": [{"version_affected": "<", "version_value": "3.6.0"}]}}]}, "vendor_name": "phpservermon"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "phpservermon is vulnerable to Improper Neutralization of CRLF Sequences"}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "version": "3.0"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-93 Improper Neutralization of CRLF Sequences"}]}]}, "references": {"reference_data": [{"name": "https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43", "refsource": "CONFIRM", "url": "https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43"}, {"name": "https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4", "refsource": "MISC", "url": "https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4"}]}, "source": {"advisory": "d617ced7-be06-4e34-9db0-63d45c003a43", "discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:16:04.220Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4"}]}]}, "cveMetadata": {"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "assignerShortName": "@huntrdev", "cveId": "CVE-2021-4097", "datePublished": "2021-12-11T23:30:10.000Z", "dateReserved": "2021-12-10T00:00:00.000Z", "dateUpdated": "2024-08-03T17:16:04.220Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:phpservermonitor:php_server_monitor:*:*:*:*:*:*:*:*", "matchCriteriaId": "9B2188E1-0FA7-40B8-9AE7-52E50B0312CC", "versionEndExcluding": "3.6.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "phpservermon is vulnerable to Improper Neutralization of CRLF Sequences"}, {"lang": "es", "value": "phpservermon es vulnerable a una Neutralizaci\u00f3n Inapropiada de Secuencias CRLF"}], "id": "CVE-2021-4097", "lastModified": "2024-11-21T06:36:53.713", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "version": "3.0"}, "exploitabilityScore": 2.8, "impactScore": 3.4, "source": "security@huntr.dev", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-12-12T00:15:07.743", "references": [{"source": "security@huntr.dev", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4"}, {"source": "security@huntr.dev", "tags": ["Exploit", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-93"}], "source": "security@huntr.dev", "type": "Secondary"}]}