{"id":"CVE-2020-6173","aliases":["GHSA-2828-9vh6-9m6j","PYSEC-2020-146"],"url":"https://o3.security/vulnerability/CVE-2020-6173","summary":"Client Denial of Service on TUF","details":"### Impact\nAn attacker who can gain file access to the repository and modify metadata files may cause a denial of service to clients by creating many invalid signatures on a metadata file. Having a large number of signatures to verify will delay the moment when the client will determine the signature is not valid. This delay may be for at least a few minutes, but possibly could be longer especially if multiple files are impacted.\n\nThe tuf maintainers would like to thank Erik MacLean of Analog Devices, Inc. for reporting this issue.\n\n### Patches\nNo fix exists for this issue. \n\n### Workarounds\nNo workarounds are known for this issue.\n\n### References\n* [CVE-2020-6173](https://nvd.nist.gov/vuln/detail/CVE-2020-6173)\n* [Issue #973](https://github.com/theupdateframework/tuf/issues/973)","published":"2020-01-14T19:15:13.797Z","modified":"2026-10-20T10:54:23.290543197Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},"epss":{"score":0.01758,"percentile":0.75923,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"PyPI","name":"tuf","fixedVersion":"0.12.2"}],"fix":null,"references":[{"type":"FIX","url":"https://github.com/theupdateframework/tuf/commits/develop"},{"type":"FIX","url":"https://github.com/theupdateframework/tuf/issues/973"},{"type":"WEB","url":"https://github.com/theupdateframework/tuf/security/advisories/GHSA-2828-9vh6-9m6j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-6173"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/tuf/PYSEC-2020-146.yaml"},{"type":"PACKAGE","url":"https://github.com/theupdateframework/tuf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:54:23.290543197Z"}}