CVE-2021-41099

Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration parameter to a very large value and constructing specially crafted network payloads or commands. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. 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/c6ad876774f3cc11e32681ea02a2eead00f2c521Patch, Third Party Advisory
• https://github.com/redis/redis/security/advisories/GHSA-j3cr-9h5g-6cphThird 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/c6ad876774f3cc11e32681ea02a2eead00f2c521Patch, Third Party Advisory
• https://github.com/redis/redis/security/advisories/GHSA-j3cr-9h5g-6cphThird 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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