CVE-2021-32627

Redis is an open source, in-memory database that persists on disk. In affected versions an integer overflow bug in Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves changing the default proto-max-bulk-len and client-query-buffer-limit configuration parameters to very large values and constructing specially crafted very large stream elements. The problem is fixed in Redis 6.2.6, 6.0.16 and 5.0.14. For users unable to upgrade 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.

• CWE-190
• CWE-680
• CWE-190

• https://github.com/redis/redis/commit/f6a40570fa63d5afdd596c78083d754081d80ae3Patch, Third Party Advisory
• https://github.com/redis/redis/security/advisories/GHSA-f434-69fm-g45vThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/
• https://security.gentoo.org/glsa/202209-17Third Party Advisory
• https://security.netapp.com/advisory/ntap-20211104-0003/Third Party Advisory
• https://www.debian.org/security/2021/dsa-5001Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
• https://github.com/redis/redis/commit/f6a40570fa63d5afdd596c78083d754081d80ae3Patch, Third Party Advisory
• https://github.com/redis/redis/security/advisories/GHSA-f434-69fm-g45vThird Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/
• https://security.gentoo.org/glsa/202209-17Third Party Advisory
• https://security.netapp.com/advisory/ntap-20211104-0003/Third Party Advisory
• https://www.debian.org/security/2021/dsa-5001Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory

Published

Oct 4, 2021

Last Modified

Jun 17, 2026

Status

Modified

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