HOMEVULNERABILITIESCVE-2021-32627
HIGH

CVE-2021-32627

CWE-190Published: October 4, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Redis is an open source, in-memory database that persists on disk. In affected versions an integer overflow bug in Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves changing the default proto-max-bulk-len and client-query-buffer-limit configuration parameters to very large values and constructing specially crafted very large stream elements. The problem is fixed in Redis 6.2.6, 6.0.16 and 5.0.14. For users unable to upgrade an additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the proto-max-bulk-len configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

NVD Source

Technical Analysis

CVE-2021-32627 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
netapp2 product(s)
management services for element softwaremanagement services for netapp hci
Oracle1 product(s)
communications operations monitor
redis1 product(s)
redis
Source: NVD CPE · 11 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/redis/redis/commit/f6a40570fa63d5afdd596c78083d754081d80ae3
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://github.com/redis/redis/commit/f6a40570fa63d5afdd596c78083d754081d80ae3
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
ADVISORYhttps://github.com/redis/redis/security/advisories/GHSA-f434-69fm-g45v
ADVISORYhttps://security.gentoo.org/glsa/202209-17
ADVISORYhttps://security.netapp.com/advisory/ntap-20211104-0003/
ADVISORYhttps://www.debian.org/security/2021/dsa-5001
ADVISORYhttps://github.com/redis/redis/security/advisories/GHSA-f434-69fm-g45v
ADVISORYhttps://security.gentoo.org/glsa/202209-17
ADVISORYhttps://security.netapp.com/advisory/ntap-20211104-0003/
ADVISORYhttps://www.debian.org/security/2021/dsa-5001

All References (18)

→
https://github.com/redis/redis/commit/f6a40570fa63d5afdd596c78083d754081d80ae3Patch · Third Party Advisory
→
https://github.com/redis/redis/security/advisories/GHSA-f434-69fm-g45vThird Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/
→
https://security.gentoo.org/glsa/202209-17Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20211104-0003/Third Party Advisory
→
https://www.debian.org/security/2021/dsa-5001Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory
→
https://github.com/redis/redis/commit/f6a40570fa63d5afdd596c78083d754081d80ae3Patch · Third Party Advisory
→
https://github.com/redis/redis/security/advisories/GHSA-f434-69fm-g45vThird Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/
→
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/
→
https://security.gentoo.org/glsa/202209-17Third Party Advisory

Quick Facts

CVE IDCVE-2021-32627
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-190
CISA KEVNo
Affected5 vendor(s)
PublishedOct 4, 2021

Related CVEs (CWE-190)

CVE-2015-5108
10.0
CVE-2025-64721
10.0
CVE-2010-3254
10.0
CVE-2015-5097
10.0
CVE-2013-2555
10.0
CVE-2008-2663
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-32627 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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