CVE-2021-3672

Public Exploit

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.

Category

5.6
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.07%
Vendor Advisory gentoo.org Vendor Advisory haxx.se
Affected: n/a c-ares
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1988342 issue tracking third party advisory
https://c-ares.haxx.se/adv_20210810.html exploit patch vendor advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf third party advisory patch
https://www.oracle.com/security-alerts/cpujul2022.html third party advisory
https://security.gentoo.org/glsa/202401-02 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-3672?
CVE-2021-3672 has been scored as a medium severity vulnerability.
How to fix CVE-2021-3672?
To fix CVE-2021-3672, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-3672 being actively exploited in the wild?
It is possible that CVE-2021-3672 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-3672?
CVE-2021-3672 affects n/a c-ares.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.