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CVE-2021-32765

8.8 · HIGH

Hiredis is a minimalistic C client library for the Redis database.

Published Oct 4, 2021CWE-190EPSS 2.14%

Overview

CVE-2021-32765 is a high-severity vulnerability. It was published on October 4, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Hiredis is a minimalistic C client library for the Redis database. In affected versions Hiredis is vulnurable to integer overflow if provided maliciously crafted or corrupted `RESP` `mult-bulk` protocol data. When parsing `multi-bulk` (array-like) replies, hiredis fails to check if `count * sizeof(redisReply*)` can be represented in `SIZE_MAX`. If it can not, and the `calloc()` call doesn't itself make this check, it would result in a short allocation and subsequent buffer overflow. Users of hiredis who are unable to update may set the [maxelements](https://github.com/redis/hiredis#reader-max-array-elements) context option to a value small enough that no overflow is possible.

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/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1eGitHubgithub.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2Reflists.debian.org/debian-lts-announce/2021/10/msg00007.htmlRefsecurity.gentoo.org/glsa/202210-32Refsecurity.netapp.com/advisory/ntap-20211104-0003/Refwiki.sei.cmu.edu/confluence/display/c/MEM07-C.+Ensure+that+the+arguments+to+calloc%28%29%2C+when+multiplied%2C+do+not+wrapGitHubgithub.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1eGitHubgithub.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2Reflists.debian.org/debian-lts-announce/2021/10/msg00007.htmlRefsecurity.gentoo.org/glsa/202210-32

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32765?

CVE-2021-32765 is a high-severity vulnerability. It was published on October 4, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-32765?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2021-32765?

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-2021-32765?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32765 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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