Is CVE-2021-3470 actively exploited?

No active exploitation of CVE-2021-3470 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-3470 be exploited remotely?

Yes. CVE-2021-3470 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-3470?

CVE-2021-3470 has a CVSS score of 5.3 (MEDIUM).

HOME VULNERABILITIESCVE-2021-3470

MEDIUM

CVE-2021-3470

CWE-119Published: March 31, 2021· Updated: Jun 17, 2026

5.3

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-3470 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.