HOMEVULNERABILITIESCVE-2021-32626
HIGH

CVE-2021-32626

CWE-122Published: October 4, 2021· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Redis is an open source, in-memory database that persists on disk. In affected versions specially crafted Lua scripts executing in Redis can cause the heap-based Lua stack to be overflowed, due to incomplete checks for this condition. This can result with heap corruption and potentially remote code execution. This problem exists in all versions of Redis with Lua scripting support, starting from 2.6. The problem is fixed in versions 6.2.6, 6.0.16 and 5.0.14. For users unable to update an additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.

NVD Source

Technical Analysis

CVE-2021-32626 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 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/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/666ed7facf4524bf6d19b11b20faa2cf93fdf591
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://github.com/redis/redis/commit/666ed7facf4524bf6d19b11b20faa2cf93fdf591
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
ADVISORYhttps://github.com/redis/redis/security/advisories/GHSA-p486-xggp-782c
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-p486-xggp-782c
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 (20)

→
https://github.com/redis/redis/commit/666ed7facf4524bf6d19b11b20faa2cf93fdf591Patch · Third Party Advisory
→
https://github.com/redis/redis/security/advisories/GHSA-p486-xggp-782cThird Party Advisory
→
https://lists.apache.org/thread.html/r75490c61c2cb7b6ae2c81238fd52ae13636c60435abcd732d41531a0%40%3Ccommits.druid.apache.org%3E
→
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/666ed7facf4524bf6d19b11b20faa2cf93fdf591Patch · Third Party Advisory
→
https://github.com/redis/redis/security/advisories/GHSA-p486-xggp-782cThird Party Advisory
→
https://lists.apache.org/thread.html/r75490c61c2cb7b6ae2c81238fd52ae13636c60435abcd732d41531a0%40%3Ccommits.druid.apache.org%3E
→
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/

Quick Facts

CVE IDCVE-2021-32626
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-122
CISA KEVNo
Affected5 vendor(s)
PublishedOct 4, 2021

Related CVEs (CWE-122)

CVE-2025-23123
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CVE-2022-34819
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CVE-2021-21940
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CVE-2026-46752
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CVE-2021-25387
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CVE-2026-44050
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-32626 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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