{"id":"CVE-2020-37056","state":"PUBLISHED","title":"Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass","description":"Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and gain unauthorized access.","publishedAt":"2026-01-30T22:07:19.891Z","updatedAt":"2026-07-28T01:47:08.564Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["Crystal Shard http-protection"],"affected":[{"vendor":"Crystal Shard","product":"http-protection","versions":[{"version":"<= 0.2.0","status":"affected"}]}],"references":["https://www.exploit-db.com/exploits/48533","https://github.com/rogeriozambon/http-protection","https://www.vulncheck.com/advisories/crystal-shard-http-protection-ip-spoofing-bypass"],"weaknesses":["CWE-290"],"ingestedAt":"2026-10-29T19:47:27.394Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2020/37xxx/CVE-2020-37056.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2020-37056","state":"PUBLISHED","datePublished":"2026-01-30T22:07:19.891Z","dateUpdated":"2026-07-28T01:47:08.564Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-01-28T18:18:30.526Z"},"containers":{"cna":{"title":"Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass","descriptions":[{"lang":"en","value":"Crystal Shard http-protection 0.2.0 contains an IP spoofing vulnerability that allows attackers to bypass protection middleware by manipulating request headers. Attackers can hardcode consistent IP values across X-Forwarded-For, X-Client-IP, and X-Real-IP headers to circumvent security checks and gain unauthorized access."}],"affected":[{"vendor":"Crystal Shard","product":"http-protection","versions":[{"version":"<= 0.2.0","status":"affected"}]}],"references":[{"url":"https://www.exploit-db.com/exploits/48533","name":"ExploitDB-48533","tags":["exploit"]},{"url":"https://github.com/rogeriozambon/http-protection","name":"HTTP Protection Crystal Shard Repository","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/crystal-shard-http-protection-ip-spoofing-bypass","name":"VulnCheck Advisory: Crystal Shard http-protection 0.2.0 - IP Spoofing Bypass","tags":["third-party-advisory"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"Authentication Bypass by Spoofing","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-07-28T01:47:08.564Z"},"datePublic":"2020-05-28T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:avg:protection:*:*:*:*:*:*:*:*","versionEndIncluding":"0.2.0"}]}]}],"credits":[{"lang":"en","value":"Halis Duraki (@0xduraki)","type":"finder"}],"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-02T20:07:01.631223Z","id":"CVE-2020-37056","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-02T20:07:10.914Z"}}]}}}