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CVE-2021-32762

7.5 · HIGH

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

Published Oct 4, 2021CWE-190EPSS 2.56%

Overview

CVE-2021-32762 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. The redis-cli command line tool and redis-sentinel service may be vulnerable to integer overflow when parsing specially crafted large multi-bulk network replies. This is a result of a vulnerability in the underlying hiredis library which does not perform an overflow check before calling the calloc() heap allocation function. This issue only impacts systems with heap allocators that do not perform their own overflow checks. Most modern systems do and are therefore not likely to be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator which is also not vulnerable. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14.

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/0215324a66af949be39b34be2d55143232c1cb71GitHubgithub.com/redis/redis/security/advisories/GHSA-833w-8v3m-8wwrReflists.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/0215324a66af949be39b34be2d55143232c1cb71

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32762?

CVE-2021-32762 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-2021-32762?

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-2021-32762?

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-2021-32762?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32762 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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