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Fencer Vulns
medium 5.5

CVE-2022-36021 json

Redis string pattern matching can be abused to achieve Denial of Service

published 2023-02-28 3 y ago modified 2026-09-08 2 mo ago also BIT-keydb-2022-36021 , BIT-redis-2022-36021 , BIT-valkey-2022-36021 , EUVD-2022-38807 , GHSA-jr7j-rfj5-8xqv

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
59.8%
EPSS 59.8% chance of exploitation in 30 days, percentile 99.1%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami keydb 6.0.18, 6.2.11, 7.0.9
  • bitnami redis 6.0.18, 6.2.11, 7.0.9
  • bitnami valkey 6.0.18, 6.2.11, 7.0.9
  • redis redis 6.0.18, 6.2.11, 7.0.9
  • redis Debian 14, Debian 13, Debian 12 5:7.0.9-1

debian advisories DEBIAN-CVE-2022-36021

  • redis Ubuntu Pro 14.04 LTS 2:2.8.4-2ubuntu0.2+esm3
  • redis Ubuntu Pro 16.04 LTS 2:3.0.6-1ubuntu0.4+esm2
  • redis Ubuntu Pro 18.04 LTS 5:4.0.9-1ubuntu0.2+esm4
  • redis Ubuntu Pro 20.04 LTS 5:5.0.7-2ubuntu0.1+esm2
  • redis Ubuntu Pro 22.04 LTS 5:6.0.16-1ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2022-36021

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • redis RHEL 8 6.2.17-1.module+el8.10.0+22680+748527fd

red hat advisories RHSA-2025:0595

  • redis7 SLE Module for Server Applications 15 SP5, openSUSE Leap 15.5 7.0.8-150500.3.3.1
  • redis SLE Module for Server Applications 15 SP4, openSUSE Leap 15.4 6.2.6-150400.3.19.1
  • redis SLE Module for Server Applications 15 SP4, openSUSE Leap 15.4 6.2.6-150400.3.16.1
  • redis SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 6.0.14-150200.6.20.1

suse advisories SUSE-SU-2023:2925-1SUSE-SU-2023:2122-1SUSE-SU-2023:0694-1SUSE-SU-2023:0693-1

  • redis openSUSE Tumbleweed 7.0.8-2.1

opensuse advisories openSUSE-SU-2024:12743-1

  • redis AlmaLinux 8 6.2.17-1.module_el8.10.0+3946+3de613d5

almalinux advisories ALSA-2025:0595

  • redis Rocky Linux 8 6.2.17-1.module+el8.10.0+1923+5b85c6a7

rocky linux advisories RLSA-2025:0595

  • redis CBL-Mariner 2.0 6.2.11-1

azure linux advisories AZL-13830

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-36021 updated cvss 5.5

redis: Specially crafted SRANDMEMBER, ZRANDMEMBER, and HRANDFIELD commands can trigger an integer overflow

  • Red Hat OpenStack Platform 13 (Queens) redis
    affected: no fix planned “Out of support scope”
  • Red Hat Software Collections rh-redis6-redis
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) redis 6.2.17-1.module+el8.10.0+22680+748527fd
    fixed: vendor fix RHSA-2025:0595
  • Red Hat Enterprise Linux 9 redis
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-046-11 updated cvss 5.5

Siemens SCALANCE XCM-/XRM-300

  • Siemens SCALANCE XCH328 (6GK5328-4TS01-2EC2) <V2.4 Siemens SCALANCE XCM324 (6GK5324-8TS01-2AC2) <V2.4 Siemens SCALANCE XCM328 (6GK5328-4TS01-2AC2) <V2.4 Siemens SCALANCE XCM332 (6GK5332-0GA01-2AC2) <V2.4 Siemens SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3) <V2.4 Siemens SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3) <V2.4
    +5 more products
    Siemens SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3) <V2.4 Siemens SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3) <V2.4
    affected: fixed in V2.4 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
20 mo ago

Exploit prediction

59.77% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami keydb
<6.0.18
>=6.2.0, <6.2.11
>=7.0.0, <7.0.9
6.0.18
6.2.11
7.0.9
bitnami redis
<6.0.18
>=6.2.0, <6.2.11
>=7.0.0, <7.0.9
6.0.18
6.2.11
7.0.9
bitnami valkey
<6.0.18
>=6.2.0, <6.2.11
>=7.0.0, <7.0.9
6.0.18
6.2.11
7.0.9

Affected products

  • redis redis

Classification

Weakness
  • CWE-407 Inefficient Algorithmic Complexity
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of redis/redis published their own advisory on GitHub. Reviewed sources take precedence over it.