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En versiones anteriores a las 0.21.2, 1.7.1, 2.15.4 y 3.0.0-alpha.3, Koa utiliza una expresión regular maliciosa para analizar los encabezados HTTP `X-Forwarded-Proto` y `X-Forwarded-Host`. Esto se puede aprovechar para llevar a cabo un ataque de denegación de servicio. Las versiones 0.21.2, 1.7.1, 2.15.4 y 3.0.0-alpha.3 solucionan el problema."}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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","baseScore":9.2,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"HIGH","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-1333"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*","versionEndExcluding":"0.21.2","matchCriteriaId":"49E8166D-828D-483B-BA33-E837335BA933"},{"vulnerable":true,"criteria":"cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*","versionStartIncluding":"1.0.0","versionEndExcluding":"1.7.1","matchCriteriaId":"FF1C3340-4EC7-4087-B14E-8188AC925867"},{"vulnerable":true,"criteria":"cpe:2.3:a:koajs:koa:*:*:*:*:*:node.js:*:*","versionStartIncluding":"2.0.0","versionEndExcluding":"2.15.4","matchCriteriaId":"88256A20-54C1-455F-9BBA-19DC6292C978"},{"vulnerable":true,"criteria":"cpe:2.3:a:koajs:koa:3.0.0:alpha0:*:*:*:node.js:*:*","matchCriteriaId":"C939FF76-3FDC-4439-8794-4DFC390B6AE5"},{"vulnerable":true,"criteria":"cpe:2.3:a:koajs:koa:3.0.0:alpha1:*:*:*:node.js:*:*","matchCriteriaId":"6C0F27D9-2CCD-4CA4-BB80-3650CA1CC7D7"},{"vulnerable":true,"criteria":"cpe:2.3:a:koajs:koa:3.0.0:alpha2:*:*:*:node.js:*:*","matchCriteriaId":"AC7C1D95-EC40-445D-A46D-5B52C771E9EE"}]}]}],"references":[{"url":"https://github.com/koajs/koa/blob/master/lib/request.js#L259","source":"security-advisories@github.com","tags":["Product"]},{"url":"https://github.com/koajs/koa/blob/master/lib/request.js#L404","source":"security-advisories@github.com","tags":["Product"]},{"url":"https://github.com/koajs/koa/commit/5054af6e31ffd451a4151a1fe144cef6e5d0d83c","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/koajs/koa/commit/5f294bb1c7c8d9c61904378d250439a321bffd32","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/koajs/koa/commit/93fe903fc966635a991bcf890cfc3427d33a1a08","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/koajs/koa/releases/tag/2.15.4","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/koajs/koa/security/advisories/GHSA-593f-38f6-jp5m","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}}]}