CVE-2021-3672
c-ares: Missing input validation of host names may lead to domain hijacking
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 10, 2021
Updated · November 2, 2026
Description
A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.6CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CWE-79 · Improper Neutralization of Input During Web Page Generation