{"id":"CVE-2021-34273","aliases":["EUVD-2021-20934","GHSA-gm6p-4hwh-9mqj"],"status":"published","title":"A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a...","description":"A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01072,"percentile":0.65188,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2021-08-03T21:24:59Z","modified":"2026-06-17T03:55:35Z","products":[{"vendor":"b2x_project","product":"b2x"}],"references":[{"url":"https://github.com/MRdoulestar/SC-RCVD/blob/main/Vulnerabilities/BTC2X.md","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34273"},{"url":"https://github.com/advisories/GHSA-gm6p-4hwh-9mqj"}],"sources":{"cve":[{"id":"CVE-2021-34273","description":"A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.","status":"published","published":"2021-08-03T21:24:59Z","modified":"2024-08-04T00:05:52.42Z","updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-20934","description":"A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.","status":"published","published":"2021-08-03T21:24:59Z","modified":"2024-08-04T00:05:52Z","updated_at":"2026-11-03T03:24:32.880562Z"}],"ghsa":[{"id":"GHSA-gm6p-4hwh-9mqj","title":"A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a...","description":"A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.","status":"published","published":"2022-05-24T19:10:02Z","modified":"2023-01-27T05:03:35Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:42:16.640621Z"}],"nvd":[{"id":"CVE-2021-34273","description":"A security flaw in the 'owned' function of a smart contract implementation for BTC2X (B2X), a tradeable Ethereum ERC20 token, allows attackers to hijack victim accounts and arbitrarily increase the digital supply of assets.","status":"published","published":"2021-08-03T22:15:09.277Z","modified":"2026-06-17T03:55:35.887Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:56.562207Z"}]}}