{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-48019", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-20T21:51:44.816Z", "datePublished": "2026-10-21T00:36:18.960Z", "dateUpdated": "2026-10-27T21:35:59.282Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-21T00:36:18.960Z" }, "datePublic": "2021-04-16T00:00:00.000Z", "title": "Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxies", "descriptions": [ { "lang": "en", "value": "Vyper before 0.2.9 deploys forwarder proxies through the built-in create_forwarder_to function that report a fixed 4096-byte RETURNDATASIZE rather than the actual return data size. Calls through these proxies can yield corrupted data when a function returns more than 4096 bytes without return data sanitation, and fail strict return-size checks such as SafeERC20.safeTransfer." } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "Buffer Access with Incorrect Length Value", "cweId": "CWE-805", "type": "CWE" } ] } ], "affected": [ { "vendor": "vyperlang", "product": "vyper", "defaultStatus": "unaffected", "packageURL": "pkg:pypi/vyper", "versions": [ { "version": "0", "status": "affected", "versionType": "python", "lessThan": "0.2.9" }, { "version": "0.2.9", "status": "unaffected", "versionType": "python" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.2.9" } ] } ] } ], "metrics": [ { "cvssV4_0": { "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 6.3, "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:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED" }, "format": "CVSS" }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L", "version": "3.1" }, "format": "CVSS" } ], "references": [ { "url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-375m-5fvv-xq23", "tags": [ "vendor-advisory" ], "name": "GitHub Security Advisory (GHSA-375m-5fvv-xq23)" }, { "name": "VulnCheck Advisory: Vyper before 0.2.9 Incorrect RETURNDATASIZE in create_forwarder_to Proxies", "tags": [ "third-party-advisory" ], "url": "https://www.vulncheck.com/advisories/vyper-before-0.2.9-incorrect-returndatasize-in-create-forwarder-to-proxies" } ], "x_generator": { "engine": "vulncheck-endgame" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-10-27T21:35:49.406598Z", "id": "CVE-2021-48019", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-27T21:35:59.282Z" } } ] } }