What is CVE-2022-36021?

CVE-2022-36021 is a medium-severity vulnerability in Redis, classified under Inefficient Algorithmic Complexity. CVSS score: 5.5/10. Published 2023-03-01.

How severe is CVE-2022-36021?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2022-36021 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Redis

CVE-2022-36021

Redis is an in-memory database that persists on disk. Authenticated users can use string matching commands (like `SCAN` or `KEYS`) with a specially crafted pattern to trigger a denial-of-service attack on Redis, causing it to hang and consume 100% CPU time. The problem is fixed in Redis versions 6.0.18, 6.2.11, 7.0.9.

Published 2023-03-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.598 (99.1th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.598 · newest: 0.598 · change: 0.000

Affected products

Redis — versions < 6.0.18, >= 6.2.0, < 6.2.11, >= 7.0.0, < 7.0.9

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity

Public proof-of-concept exploits

References

github.com/redis/redis/security/advisories/GHSA-jr7j-rfj5-8xqv (Vendor Advisory)
github.com/redis/redis/commit/dcbfcb916ca1a269b3feef86ee86835294758f84 (Patch)

Frequently asked questions

What is CVE-2022-36021?: CVE-2022-36021 is a medium-severity vulnerability in Redis, classified under Inefficient Algorithmic Complexity. CVSS score: 5.5/10. Published 2023-03-01.
How severe is CVE-2022-36021?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2022-36021 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.