CVE-2022-36021: redis Inefficient Algorithmic Complexity
Vulnerability summary
CVE-2022-36021 is a medium (CVSS 5.5) Inefficient Algorithmic Complexity vulnerability in redis. EPSS estimates a 59.77% chance of exploitation in the next 30 days, higher than 99.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 9 · Related 7Timeline
- 01-03-2023PublishedVulnerability first disclosed.
- 07-03-2025Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
59.77%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
0.00 pp
From 59.77% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- redis< 5:5.0.14-1+deb10u3 | < 5:7.0.9-1
Redis1 product
- redis< 6.0.18 | ≥ 6.2.0, < 6.2.11 | ≥ 7.0.0, < 7.0.9
Ubuntu1 product
- redis< 2:2.8.4-2ubuntu0.2+esm3 | < 2:3.0.6-1ubuntu0.4+esm2 | < 5:4.0.9-1ubuntu0.2+esm4 | < 5:5.0.7-2ubuntu0.1+esm2 | < 5:6.0.16-1ubuntu1+esm1
3 vendors · 3 products
References
7 links- github.com/redis/redis/security/advisories/GHSA-jr7j-rfj5-8xqvX Refsource CONFIRMREPORTVendor Advisory
