CVE-2021-32628— Vulnerability in handling large ziplists
Quick assessment
Affected
redis redis
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Redis Labs Redis是美国Redis Labs公司的一套开源的使用ANSI C编写、支持网络、可基于内存亦可持久化的日志型、键值（Key-Value）存储数据库，并提供多种语言的API。 Redis 存在输入验证错误漏洞，该漏洞可导致远程代码执行。
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1552 · Unsecured Credentials T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32628
Vulnerability Information
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Vulnerability Title
Vulnerability in handling large ziplists
Source: CVE Program / CVE List V5
Vulnerability Description
Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the ziplist data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves modifying the default ziplist configuration parameters (hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries or zset-max-ziplist-value) to a very large value, and then constructing specially crafted commands to create very large ziplists. The problem is fixed in Redis versions 6.2.6, 6.0.16, 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the above configuration parameters. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Redis Labs Redis 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Redis Labs Redis是美国Redis Labs公司的一套开源的使用ANSI C编写、支持网络、可基于内存亦可持久化的日志型、键值（Key-Value）存储数据库，并提供多种语言的API。 Redis 存在输入验证错误漏洞，该漏洞可导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-32628
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
Qwen3.6-35B-A3B
· 8093 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month
III. Intelligence Information for CVE-2021-32628
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Patches & Fixes for CVE-2021-32628 (1)
Vendor Advisories for CVE-2021-32628 (5)
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https://security.netapp.com/advisory/ntap-20211104-0003/ x_refsource_CONFIRM
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https://github.com/redis/redis/security/advisories/GHSA-vw22-qm3h-49pr x_refsource_CONFIRM
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https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
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Mailing List Discussions for CVE-2021-32628 (3)
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/ vendor-advisory x_refsource_FEDORA
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https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/ vendor-advisory x_refsource_FEDORA
Same Patch Batch · redis · 2021-10-04 · 9 CVEs total
| CVE-2021-32765 | 8.8 HIGH | Integer Overflow to Buffer Overflow in Hiredis |
| CVE-2021-32626 | 7.5 HIGH | Lua scripts can overflow the heap-based Lua stack in Redis |
| CVE-2021-32627 | 7.5 HIGH | Integer overflow issue with Streams in Redis |
| CVE-2021-32675 | 7.5 HIGH | DoS vulnerability in Redis |
| CVE-2021-32687 | 7.5 HIGH | Integer overflow issue with intsets in Redis |
| CVE-2021-32762 | 7.5 HIGH | Integer overflow that can lead to heap overflow in redis-cli, redis-sentinel on some platf |
| CVE-2021-41099 | 7.5 HIGH | Integer overflow issue with strings in Redis |
| CVE-2021-32672 | 5.3 MEDIUM | Vulnerability in Lua Debugger in Redis |
IV. Related Vulnerabilities
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-
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CVE-2026-23631
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CVE-2026-23479
redis-server use-after-free in unblock client flow may allow
Same vendor: redis
-
CVE-2026-81934
Redis TLS pending-data list use-after-free -
CVE-2026-66373
Redis 资源管理错误漏洞 -
CVE-2026-25243
redis-server RESTORE invalid memory access may allow remote -
CVE-2026-23631
redis-server Lua use-after-free may allow remote code execut -
CVE-2026-23479
redis-server use-after-free in unblock client flow may allow
V. Comments for CVE-2021-32628
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