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Vulnerabilities / CVE-2021-3466

critical

CVE-2021-3466

libmicrohttpd: Buffer overflow issue in URL parser in the post_process_urlencoded function

Published Modified CWE 120
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high).

Description

A flaw was found in libmicrohttpd. A missing bounds check in the post_process_urlencoded function leads to a buffer overflow, allowing a remote attacker to write arbitrary data in an application that uses libmicrohttpd. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. Only version 0.9.70 is vulnerable.

Affected packages and fixed versions

SourcePackageFixed in
debian 11libmicrohttpd0.9.71-1
debian 12libmicrohttpd0.9.71-1
debian 13libmicrohttpd0.9.71-1
debian 14libmicrohttpd0.9.71-1
echolibmicrohttpd, libmicrohttpd-0.9.700.9.71-1 and 1 more
Show all 6 entries from 5 sources
SourcePackageFixed in
debian 11libmicrohttpd0.9.71-1
debian 12libmicrohttpd0.9.71-1
debian 13libmicrohttpd0.9.71-1
debian 14libmicrohttpd0.9.71-1
echolibmicrohttpd0.9.71-1
echolibmicrohttpd-0.9.700.9.70+e1

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.