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CVE-2021-41099

7.5 · HIGH

Redis is an open source, in-memory database that persists on disk.

Published Oct 4, 2021CWE-190EPSS 3.65%

Overview

CVE-2021-41099 is a high-severity vulnerability. It was published on October 4, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/redis/redis/commit/c6ad876774f3cc11e32681ea02a2eead00f2c521GitHubgithub.com/redis/redis/security/advisories/GHSA-j3cr-9h5g-6cphReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HTYQ5ZF37HNGTZWVNJD3VXP7I6MEEF42/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VL5KXFN3ATM7IIM7Q4O4PWTSRGZ5744Z/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WR5WKJWXD4D6S3DJCZ56V74ESLTDQRAB/Refsecurity.gentoo.org/glsa/202209-17Refsecurity.netapp.com/advisory/ntap-20211104-0003/Refwww.debian.org/security/2021/dsa-5001Refwww.oracle.com/security-alerts/cpuapr2022.htmlGitHubgithub.com/redis/redis/commit/c6ad876774f3cc11e32681ea02a2eead00f2c521

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41099?

CVE-2021-41099 is a high-severity vulnerability. It was published on October 4, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-41099?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-41099?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-41099?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41099 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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