{"id":"CVE-2021-32761","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-32761","generatedAt":"2026-10-27T22:28:39.653Z","title":"A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5.","description":"Redis is an in-memory database that persists on disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5. On 32-bit systems, Redis `*BIT*` command are vulnerable to integer overflow that can potentially be exploited to corrupt the heap, leak arbitrary heap contents or trigger remote code execution. The vulnerability involves changing the default `proto-max-bulk-len` configuration parameter to a very large value and constructing specially crafted commands bit commands. This problem only affects Redis on 32-bit platforms, or compiled as a 32-bit binary. Redis versions 5.0.`3m 6.0.15, and 6.2.5 contain patches for this issue. An additional workaround to mitigate the problem without patching the `redis-server` executable is to prevent users from modifying the `proto-max-bulk-len` configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.","published":"2021-07-21T21:15:08.000Z","lastModified":"2026-06-17T03:53:35.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-125","CWE-680","CWE-190"],"affected":["redislabs/redis","debian/debian linux","fedoraproject/fedora"],"epss":{"score":0.36553,"percentile":0.98485,"date":"2026-10-26","history":[{"date":"2026-09-20","score":0.37633,"percentile":0.98469},{"date":"2026-09-22","score":0.31172,"percentile":0.98191},{"date":"2026-09-23","score":0.37772,"percentile":0.9848},{"date":"2026-09-25","score":0.31172,"percentile":0.98212},{"date":"2026-10-01","score":0.37772,"percentile":0.98502},{"date":"2026-10-02","score":0.31172,"percentile":0.98224},{"date":"2026-10-16","score":0.37772,"percentile":0.9853},{"date":"2026-10-17","score":0.30103,"percentile":0.98203},{"date":"2026-10-18","score":0.36553,"percentile":0.98484},{"date":"2026-10-19","score":0.30103,"percentile":0.98205},{"date":"2026-10-20","score":0.36553,"percentile":0.98487},{"date":"2026-10-21","score":0.30103,"percentile":0.98215},{"date":"2026-10-26","score":0.36553,"percentile":0.98485}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 36.6%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-26T00:00:00.000Z","detail":{"to":0.36553,"from":0.30103,"percentile":0.98485},"summary":"EPSS moved from 30.1% to 36.6% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-10-20T00:00:00.000Z","detail":{"to":0.36553,"from":0.30103,"percentile":0.98487},"summary":"EPSS moved from 30.1% to 36.6% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-10-18T00:00:00.000Z","detail":{"to":0.36553,"from":0.30103,"percentile":0.98484},"summary":"EPSS moved from 30.1% to 36.6% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-10-16T00:00:00.000Z","detail":{"to":0.37772,"from":0.31172,"percentile":0.9853},"summary":"EPSS moved from 31.2% to 37.8% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-10-01T00:00:00.000Z","detail":{"to":0.37772,"from":0.31172,"percentile":0.98502},"summary":"EPSS moved from 31.2% to 37.8% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-23T00:00:00.000Z","detail":{"to":0.37772,"from":0.31172,"percentile":0.9848},"summary":"EPSS moved from 31.2% to 37.8% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-20T00:00:00.000Z","detail":{"to":0.37633,"from":0.31049,"percentile":0.98469},"summary":"EPSS moved from 31.0% to 37.6% probability of exploitation in the next thirty days."}],"references":[{"url":"https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wj","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00017.html","tags":["Mailing List","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00026.html","tags":["Mailing List","Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6O7AUOROBYGP5IMGJPC5HZ3R2RB6GZ5X/","source":"security-advisories@github.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGX7RRAWGXWXEAKJTQYSDSBO2BC3SAHD/","source":"security-advisories@github.com"},{"url":"https://security.gentoo.org/glsa/202209-17","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://security.netapp.com/advisory/ntap-20210827-0004/","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://www.debian.org/security/2021/dsa-5001","tags":["Third Party Advisory"],"source":"security-advisories@github.com"},{"url":"https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wj","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/07/msg00017.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00026.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6O7AUOROBYGP5IMGJPC5HZ3R2RB6GZ5X/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGX7RRAWGXWXEAKJTQYSDSBO2BC3SAHD/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202209-17","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210827-0004/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2021/dsa-5001","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-32761","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}