CVE-2020-28501

Regular Expression Denial of Service (ReDoS)

View on CVE.org

Published Mar 22, 2021 CVSS 3.1 · 5.3 Medium EPSS 1.5% KEV · Not listed

Description

This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.

Affected Products

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

Vendor Product Default status Versions

n/a

es6-crawler-detect

affected

Version	Status	Constraints
`unspecified`	affected	< 3.1.3

Configuration 1 [-]

cpe:2.3:a:crawlerdetect_project:crawlerdetect:*:*:*:*:*:node.js:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-0844	This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.
Github GHSA	GHSA-jxg6-fhwc-9v9c	Regular Expression Denial of Service (ReDoS) in es6-crawler-detect

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: 1.5% (1.498% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/JefferyHus/es6-crawler-detect/pull/27
https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529

History

No history.

Subscriptions

Crawlerdetect Project Crawlerdetect

Weaknesses

NVD-CWE-Other

Sources

CVE record Updated: Sep 16, 2024, 10:40 PM

Status: PUBLISHED
Assigner: snyk
Published: Mar 22, 2021, 12:10 PM
Updated: Sep 16, 2024, 10:40 PM
Reserved: Nov 12, 2020, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 3:10 AM

Status: Modified
Published: Mar 22, 2021, 12:15 PM
Modified: Jun 17, 2026, 3:10 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"containers": {"cna": {"affected": [{"product": "es6-crawler-detect", "vendor": "n/a", "versions": [{"lessThan": "3.1.3", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "credits": [{"lang": "en", "value": "Eran Levin"}], "datePublic": "2021-03-22T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"description": "Regular Expression Denial of Service (ReDoS)", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-03-22T12:10:13.000Z", "orgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730", "shortName": "snyk"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/JefferyHus/es6-crawler-detect/pull/27"}], "title": "Regular Expression Denial of Service (ReDoS)", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "report@snyk.io", "DATE_PUBLIC": "2021-03-22T12:08:45.601570Z", "ID": "CVE-2020-28501", "STATE": "PUBLIC", "TITLE": "Regular Expression Denial of Service (ReDoS)"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "es6-crawler-detect", "version": {"version_data": [{"version_affected": "<", "version_value": "3.1.3"}]}}]}, "vendor_name": "n/a"}]}}, "credit": [{"lang": "eng", "value": "Eran Levin"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "Regular Expression Denial of Service (ReDoS)"}]}]}, "references": {"reference_data": [{"name": "https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529", "refsource": "MISC", "url": "https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529"}, {"name": "https://github.com/JefferyHus/es6-crawler-detect/pull/27", "refsource": "MISC", "url": "https://github.com/JefferyHus/es6-crawler-detect/pull/27"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T16:40:59.764Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/JefferyHus/es6-crawler-detect/pull/27"}]}]}, "cveMetadata": {"assignerOrgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730", "assignerShortName": "snyk", "cveId": "CVE-2020-28501", "datePublished": "2021-03-22T12:10:13.637Z", "dateReserved": "2020-11-12T00:00:00.000Z", "dateUpdated": "2024-09-16T22:40:25.230Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "es6-crawler-detect", "vendor": "n/a", "versions": [{"lessThan": "3.1.3", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "report@snyk.io"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:crawlerdetect_project:crawlerdetect:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "68E99CD1-4EC0-4BC6-AE57-A1242B38A20B", "versionEndExcluding": "3.1.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators."}, {"lang": "es", "value": "Esto afecta al paquete es6-crawler-detect versiones anteriores a 3.1.3. No se presenta limitaci\u00f3n de la longitud de la cadena del agente de usuario proporcionada a los operadores de expresiones regulares"}], "id": "CVE-2020-28501", "lastModified": "2026-06-17T03:10:32.923", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "report@snyk.io", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-03-22T12:15:13.673", "references": [{"source": "report@snyk.io", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/JefferyHus/es6-crawler-detect/pull/27"}, {"source": "report@snyk.io", "tags": ["Exploit", "Third Party Advisory"], "url": "https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/JefferyHus/es6-crawler-detect/pull/27"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://snyk.io/vuln/SNYK-JS-ES6CRAWLERDETECT-1051529"}], "sourceIdentifier": "report@snyk.io", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}