CVE-2021-41099— Integer overflow issue with strings in Redis
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I. Basic Information for CVE-2021-41099
Vulnerability Information
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Vulnerability Title
Integer overflow issue with strings in Redis
Source: NVD (National Vulnerability Database)
Vulnerability Description
Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration parameter to a very large value and constructing specially crafted network payloads or commands. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
Source: NVD (National Vulnerability Database)
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，该漏洞可能导致拒绝服务或远程代码执行。
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-2021-41099
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|---|
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- https://security.netapp.com/advisory/ntap-20211104-0003/x_refsource_CONFIRM
- https://github.com/redis/redis/security/advisories/GHSA-j3cr-9h5g-6cphx_refsource_CONFIRM
- https://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2021-41099
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-2021-32628 | 7.5 HIGH | Vulnerability in handling large ziplists |
| 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-2021-32672 | 5.3 MEDIUM | Vulnerability in Lua Debugger in Redis |
IV. Related Vulnerabilities
Same product: redis
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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 - CVE-2025-62507
Redis: Bug in XACKDEL may lead to stack overflow and potenti - CVE-2025-49844
Redis Lua Use-After-Free may lead to remote code execution
Same vendor: redis
- 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 - CVE-2025-62507
Redis: Bug in XACKDEL may lead to stack overflow and potenti - CVE-2025-49844
Redis Lua Use-After-Free may lead to remote code execution
Same weakness: CWE-190
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V. Comments for CVE-2021-41099
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