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CVE-2021-3672

MEDIUMCVSS 5.6/10EPSS 2.62%

Last modified

CVE-2021-3672 is a medium-severity vulnerability rated 5.6/10 on the CVSS scale. 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.. EPSS estimates a 2.62% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
5.6/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS Probability
2.62%

83.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
C-Ares ProjectC-Ares>= 1.0.0, < 1.17.2
FedoraprojectFedora33
FedoraprojectFedora34
RedhatEnterprise Linux7.0
RedhatEnterprise Linux7.7
RedhatEnterprise Linux8.0
RedhatEnterprise Linux Computer Node1
RedhatEnterprise Linux Eus7.7
RedhatEnterprise Linux Eus8.1
RedhatEnterprise Linux Eus8.2
RedhatEnterprise Linux Eus8.4
RedhatEnterprise Linux For Ibm Z Systems8.0
RedhatEnterprise Linux For Ibm Z Systems Eus8.1
RedhatEnterprise Linux For Ibm Z Systems Eus8.2
RedhatEnterprise Linux For Ibm Z Systems Eus8.4
RedhatEnterprise Linux For Power Little Endian8.0
RedhatEnterprise Linux For Power Little Endian Eus8.1
RedhatEnterprise Linux For Power Little Endian Eus8.2
RedhatEnterprise Linux For Power Little Endian Eus8.4
RedhatEnterprise Linux Server Aus8.2
RedhatEnterprise Linux Server Aus8.4
RedhatEnterprise Linux Server Tus8.2
RedhatEnterprise Linux Server Tus8.4
RedhatEnterprise Linux Server Update Services For Sap Solutions8.1
RedhatEnterprise Linux Server Update Services For Sap Solutions8.2
RedhatEnterprise Linux Server Update Services For Sap Solutions8.4
RedhatEnterprise Linux Tus8.4
RedhatEnterprise Linux Workstation1
SiemensSinec Infrastructure Network Services< 1.0.1.1
NodejsNode.Js>= 12.0.0, <= 12.12.0
NodejsNode.Js>= 12.13.0, < 12.22.5
NodejsNode.Js>= 14.0.0, <= 14.14.0
NodejsNode.Js>= 14.15.0, < 14.17.5
NodejsNode.Js>= 16.0.0, < 16.6.2
PgbouncerPgbouncer<= 1.17.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-3672?
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.
How severe is CVE-2021-3672?
CVE-2021-3672 has a CVSS score of 5.6/10 (MEDIUM severity). The EPSS model estimates a 2.62% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3672?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3672?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST