CVE-2021-32628: Debian Linux

High severity, CVSS 7.5. EPSS: 13.5% chance of exploitation in the next 30 days.

Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the ziplist data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves modifying the default ziplist configuration parameters (hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries or zset-max-ziplist-value) to a very large value, and then constructing specially crafted commands to create very large ziplists. The problem is fixed in Redis versions 6.2.6, 6.0.16, 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the above configuration parameters. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 33 only; version 34 only; version 35 only
• Netapp Management Services For Element Software: affected versions not specified
• Netapp Management Services For Netapp Hci: affected versions not specified
• Oracle Communications Operations Monitor: version 4.3 only; version 4.4 only; version 5.0 only
• Redis Redis: from 5.0.0, before 5.0.14 (fixed in 5.0.14); from 6.0.0, before 6.0.16 (fixed in 6.0.16); from 6.2.0, before 6.2.6 (fixed in 6.2.6)

Published 2021-10-04. Last modified 2026-06-17.