CVE-2021-3470

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-31 · updated 2026-06-17
Weakness: CWE-119

Description

A heap overflow issue was found in Redis in versions before 5.0.10, before 6.0.9 and before 6.2.0 when using a heap allocator other than jemalloc or glibc's malloc, leading to potential out of bound write or process crash. Effectively this flaw does not affect the vast majority of users, who use jemalloc or glibc malloc.

Affected products

Redis Labs Redis: before 5.0.10; from 6.0.0 before 6.0.9; 6.2.0-rc1, 6.2.0-rc2, 6.2.0-rc3 — fixed in 5.0.10, 6.0.9

How to fix

Upgrade to a fixed version: Redis Labs Redis 5.0.10, 6.0.9. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1943623
https://bugzilla.redhat.com/show_bug.cgi?id=1943623

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