CVE-2021-32627: Debian Linux

High severity, CVSS 7.5. EPSS: 3.9% chance of exploitation in the next 30 days.

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.

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.