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CVE-2021-32626

Lua scripts can overflow the heap-based Lua stack in Redis

HIGH
8.8
CVSS Score
Published: October 4, 2021 at 05:30 PM UTC
Updated: June 17, 2026 at 03:53 AM UTC
6 products affected across 5 vendorsDebian LinuxFedoraRedis

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Severity
HIGH8.8
Exploit prediction
EPSS 16%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.011.0
Fedora· Fedora Projectrpm
95%
333435
Management Services for Element Software· NetApp
95%
All versions
Management Services for NetApp Hci· NetApp
95%
All versions
Communications Operations Monitor· Oracledrupal
95%
4.34.45.0
Redis· Redis
95%
v < 5.0.14v < 6.0.16v < 6.2.62.6 ≤ v < 5.0.146.0.0 ≤ v < 6.0.166.2.0 ≤ v < 6.2.6
Affected range stops below 5.0.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.0.16, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2.6, so it looks safe — our inference, not a vendor statement

References (10)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/redis/redis/commit/666ed7facf4524bf6d19b11b20faa2cf93fdf591
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/redis/redis/security/advisories/GHSA-p486-xggp-782c
Mailing Listx_refsource_MLIST
Source: [email protected]
https://lists.apache.org/thread.html/r75490c61c2cb7b6ae2c81238fd52ae13636c60435abcd732d41531a0%40%3Ccommits.druid.apache.org%3E
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202209-17
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20211104-0003/

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-122CWE-787

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