CVE-2021-3672

moderate-risk
Published 2021-11-23

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.

Do I need to act?

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0.06% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.6/10 Medium
NETWORK / HIGH complexity

Affected Products (20)

Enterprise Linux Computer Node

Affected Vendors

Redhat Siemens Fedoraproject Nodejs C-Ares Project Pgbouncer

References (10)

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1988342
Exploit https://c-ares.haxx.se/adv_20210810.html
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
https://security.gentoo.org/glsa/202401-02
Third Party Advisory https://www.oracle.com/security-alerts/cpujul2022.html
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1988342
Exploit https://c-ares.haxx.se/adv_20210810.html
Patch https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
https://security.gentoo.org/glsa/202401-02
Third Party Advisory https://www.oracle.com/security-alerts/cpujul2022.html
41
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 23/34 · High