{"id":"CVE-2021-21401","state":"PUBLISHED","title":"Invalid free() call in Nanopb","description":"Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid `free()` or `realloc()` calls if the message type contains an `oneof` field, and the `oneof` directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds.","publishedAt":"2021-03-23T17:45:19.000Z","updatedAt":"2024-08-03T18:09:16.087Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["nanopb nanopb"],"affected":[{"vendor":"nanopb","product":"nanopb","versions":[{"version":">= 0.3.2, <= 0.3.9.7","status":"affected"},{"version":">= 0.4.0, <= 0.4.4","status":"affected"}]}],"references":["https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88","https://github.com/nanopb/nanopb/issues/647","https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261","https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1"],"weaknesses":["CWE-763"],"ingestedAt":"2026-10-29T19:47:59.168Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/21xxx/CVE-2021-21401.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-21401","state":"PUBLISHED","datePublished":"2021-03-23T17:45:19.000Z","dateUpdated":"2024-08-03T18:09:16.087Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2020-12-22T00:00:00.000Z"},"containers":{"cna":{"title":"Invalid free() call in Nanopb","descriptions":[{"lang":"en","value":"Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid `free()` or `realloc()` calls if the message type contains an `oneof` field, and the `oneof` directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds."}],"affected":[{"vendor":"nanopb","product":"nanopb","versions":[{"version":">= 0.3.2, <= 0.3.9.7","status":"affected"},{"version":">= 0.4.0, <= 0.4.4","status":"affected"}]}],"references":[{"url":"https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nanopb/nanopb/issues/647","tags":["x_refsource_MISC"]},{"url":"https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261","tags":["x_refsource_MISC"]},{"url":"https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-763","description":"CWE-763: Release of Invalid Pointer or Reference","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","dateUpdated":"2021-03-23T17:45:19.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa"},"source":{"advisory":"GHSA-7mv5-5mxh-qg88","discovery":"UNKNOWN"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-21401","STATE":"PUBLIC","TITLE":"Invalid free() call in Nanopb"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"nanopb","version":{"version_data":[{"version_value":">= 0.3.2, <= 0.3.9.7"},{"version_value":">= 0.4.0, <= 0.4.4"}]}}]},"vendor_name":"nanopb"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Nanopb is a small code-size Protocol Buffers implementation in ansi C. In Nanopb before versions 0.3.9.8 and 0.4.5, decoding a specifically formed message can cause invalid `free()` or `realloc()` calls if the message type contains an `oneof` field, and the `oneof` directly contains both a pointer field and a non-pointer field. If the message data first contains the non-pointer field and then the pointer field, the data of the non-pointer field is incorrectly treated as if it was a pointer value. Such message data rarely occurs in normal messages, but it is a concern when untrusted data is parsed. This has been fixed in versions 0.3.9.8 and 0.4.5. See referenced GitHub Security Advisory for more information including workarounds."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-763: Release of Invalid Pointer or Reference"}]}]},"references":{"reference_data":[{"name":"https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88","refsource":"CONFIRM","url":"https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88"},{"name":"https://github.com/nanopb/nanopb/issues/647","refsource":"MISC","url":"https://github.com/nanopb/nanopb/issues/647"},{"name":"https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261","refsource":"MISC","url":"https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261"},{"name":"https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1","refsource":"MISC","url":"https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1"}]},"source":{"advisory":"GHSA-7mv5-5mxh-qg88","discovery":"UNKNOWN"}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/nanopb/nanopb/security/advisories/GHSA-7mv5-5mxh-qg88","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/nanopb/nanopb/issues/647","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/nanopb/nanopb/commit/e2f0ccf939d9f82931d085acb6df8e9a182a4261","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/nanopb/nanopb/blob/c9124132a604047d0ef97a09c0e99cd9bed2c818/CHANGELOG.txt#L1","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T18:09:16.087Z"}}]}}}