{"id":"CVE-2021-37606","aliases":["EUVD-2021-24164","GHSA-gg5h-j88q-crj5"],"status":"published","title":"Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query...","description":"Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query whether there's a collision in the bottom bits of the hashes of two messages, as demonstrated by an attack against a long-running web service that allows the attacker to infer collisions by measuring timing differences.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00741,"percentile":0.54976,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-203","CWE-326","CWE-327"],"published":"2021-07-28T18:34:57Z","modified":"2026-06-17T04:00:49Z","products":[{"vendor":"meow_hash_project","product":"meow_hash"}],"references":[{"url":"https://news.ycombinator.com/item?id=27978878","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://peter.website/meow-hash-cryptanalysis","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-37606"},{"url":"https://github.com/advisories/GHSA-gg5h-j88q-crj5"}],"sources":{"cve":[{"id":"CVE-2021-37606","description":"Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query whether there's a collision in the bottom bits of the hashes of two messages, as demonstrated by an attack against a long-running web service that allows the attacker to infer collisions by measuring timing differences.","status":"published","published":"2021-07-28T18:34:57Z","modified":"2024-08-04T01:23:01.32Z","updated_at":"2026-11-02T14:32:58.028461Z"}],"euvd":[{"id":"EUVD-2021-24164","description":"Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query whether there's a collision in the bottom bits of the hashes of two messages, as demonstrated by an attack against a long-running web service that allows the attacker to infer collisions by measuring timing differences.","status":"published","published":"2021-07-28T18:34:57Z","modified":"2024-08-04T01:23:01Z","updated_at":"2026-11-03T03:24:26.681577Z"}],"ghsa":[{"id":"GHSA-gg5h-j88q-crj5","title":"Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query...","description":"Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query whether there's a collision in the bottom bits of the hashes of two messages, as demonstrated by an attack against a long-running web service that allows the attacker to infer collisions by measuring timing differences.","status":"published","published":"2022-05-24T19:09:19Z","modified":"2023-08-08T15:31:19Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:54:44.111289Z"}],"nvd":[{"id":"CVE-2021-37606","description":"Meow hash 0.5/calico does not sufficiently thwart key recovery by an attacker who can query whether there's a collision in the bottom bits of the hashes of two messages, as demonstrated by an attack against a long-running web service that allows the attacker to infer collisions by measuring timing differences.","status":"published","published":"2021-07-30T14:15:22.153Z","modified":"2026-06-17T04:00:49.443Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-203","CWE-326"],"updated_at":"2026-11-02T14:06:56.185362Z"}]}}