VulnerabilityModified

CVE-2021-3466

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.

CRITICAL 9.8EPSS 8.74%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (8.74%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 8.74% probability · 95th percentile
CISA KEV: Not listed
Weakness: CWE-120
Affected: gnu/libmicrohttpd · redhat/enterprise linux · fedoraproject/fedora
Source: secalert@redhat.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.