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CVE-2021-3716

3.1 · LOW

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary.

Published Mar 2, 2022CWE-924EPSS 0.58%

Overview

CVE-2021-3716 is a low-severity vulnerability. It was published on March 2, 2022 and has a CVSS 3.1 base score of 3.1 (LOW).

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

Technical description

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.

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

Refbugzilla.redhat.com/show_bug.cgi?id=1994695Refgitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fdRefgitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8Reflistman.redhat.com/archives/libguestfs/2021-August/msg00083.htmlRefwww.openwall.com/lists/oss-security/2021/08/18/2Refbugzilla.redhat.com/show_bug.cgi?id=1994695Refgitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fdRefgitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8Reflistman.redhat.com/archives/libguestfs/2021-August/msg00083.htmlRefwww.openwall.com/lists/oss-security/2021/08/18/2

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3716?

CVE-2021-3716 is a low-severity vulnerability. It was published on March 2, 2022 and has a CVSS 3.1 base score of 3.1 (LOW).

How severe is CVE-2021-3716?

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

How do I fix or remediate CVE-2021-3716?

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-2021-3716?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3716 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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