Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-32761
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:46 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-32761
Complete source record
{
"id": "a9dc9614caf2bf8fb772e09c7068fcfdb6263eb2fea4c6e8f71f4f9c57a43f0b",
"url": "https://osv.dev/vulnerability/CVE-2021-32761",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-32761",
"summary": "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.",
"evidence": "osv:CVE-2021-32761",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-32761",
"aliases": [
"CVE-2021-32761",
"GHSA-8wxq-j7rp-g8wj"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/redis/redis",
"type": "GIT",
"events": [
{
"introduced": "595b5974f8865d5f77b8914336355472a619449d"
},
{
"fixed": "021af7629590c638ae0d4867d4b397f6e0c38ec8"
},
{
"introduced": "17dfd7cabbf7954f92b7a1243d4bb27fee5d4500"
},
{
"fixed": "e0cf85b8484d0985cdd80fc295e4963ab3970877"
},
{
"introduced": "445aa844b946a8f1bc21ac8554b44adb1ecb4018"
},
{
"fixed": "db09f6eb2e70ae0661a0cd9ad9b58b9b566311a9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:redislabs:redis:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.2.0"
},
{
"fixed": "5.0.13"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:redislabs:redis:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0"
},
{
"fixed": "6.0.15"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:redislabs:redis:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.2.5"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"6.0.14",
"6.2.4",
"6.2.3",
"6.0.13",
"6.2.2",
"6.0.12",
"6.2.1",
"6.2.0",
"6.0.11",
"6.0.10",
"6.0.9",
"6.0.8",
"6.0.7",
"6.0.6",
"6.0.5",
"6.0.4",
"6.0.3",
"6.0.2",
"6.0.1",
"6.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32761.json"
}
}
],
"modified": "2026-10-20T10:54:42.786498559Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6O7AUOROBYGP5IMGJPC5HZ3R2RB6GZ5X/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGX7RRAWGXWXEAKJTQYSDSBO2BC3SAHD/",
"https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wj",
"https://lists.debian.org/debian-lts-announce/2021/07/msg00017.html",
"https://lists.debian.org/debian-lts-announce/2021/08/msg00026.html",
"https://security.gentoo.org/glsa/202209-17",
"https://security.netapp.com/advisory/ntap-20210827-0004/",
"https://www.debian.org/security/2021/dsa-5001"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
},
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
},
{
"introduced": "11.0"
},
{
"last_affected": "11.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "33"
},
{
"last_affected": "33"
},
{
"introduced": "34"
},
{
"last_affected": "34"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-32761",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 385963,
"published_at": "2021-07-21T21:15:07.67+00:00"
}