CVE-2021-3672
MEDIUM
Published Nov 23, 20214y ago · Modified Jun 17, 20262w ago
5.6 CVSS 3.1
Published Nov 23, 2021 4y ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability Low
Threat Intelligence
No active exploitation signals — not in CISA KEV and no EPSS score yet.
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 1
CWE-79 Cross-site Scripting Injection
Affected Products 35
| Vendor | Product | Version | Range |
|---|---|---|---|
| c-ares_project | c-ares | * | ≥1.0.0 – <1.17.2 |
| fedoraproject | fedora | 33 | any |
| fedoraproject | fedora | 34 | any |
| redhat | enterprise_linux | 7.0 | any |
| redhat | enterprise_linux | 7.7 | any |
| redhat | enterprise_linux | 8.0 | any |
| redhat | enterprise_linux_computer_node | 1 | any |
| redhat | enterprise_linux_eus | 7.7 | any |
| redhat | enterprise_linux_eus | 8.1 | any |
| redhat | enterprise_linux_eus | 8.2 | any |
| redhat | enterprise_linux_eus | 8.4 | any |
| redhat | enterprise_linux_for_ibm_z_systems | 8.0 | any |
| redhat | enterprise_linux_for_ibm_z_systems_eus | 8.1 | any |
| redhat | enterprise_linux_for_ibm_z_systems_eus | 8.2 | any |
| redhat | enterprise_linux_for_ibm_z_systems_eus | 8.4 | any |
| redhat | enterprise_linux_for_power_little_endian | 8.0 | any |
| redhat | enterprise_linux_for_power_little_endian_eus | 8.1 | any |
| redhat | enterprise_linux_for_power_little_endian_eus | 8.2 | any |
| redhat | enterprise_linux_for_power_little_endian_eus | 8.4 | any |
| redhat | enterprise_linux_server_aus | 8.2 | any |
| redhat | enterprise_linux_server_aus | 8.4 | any |
| redhat | enterprise_linux_server_tus | 8.2 | any |
| redhat | enterprise_linux_server_tus | 8.4 | any |
| redhat | enterprise_linux_server_update_services_for_sap_solutions | 8.1 | any |
| redhat | enterprise_linux_server_update_services_for_sap_solutions | 8.2 | any |
| redhat | enterprise_linux_server_update_services_for_sap_solutions | 8.4 | any |
| redhat | enterprise_linux_tus | 8.4 | any |
| redhat | enterprise_linux_workstation | 1 | any |
| siemens | sinec_infrastructure_network_services | * | <1.0.1.1 |
| nodejs | node.js | * | ≥12.0.0 – ≤12.12.0 |
| nodejs | node.js | * | ≥12.13.0 – <12.22.5 |
| nodejs | node.js | * | ≥14.0.0 – ≤14.14.0 |
| nodejs | node.js | * | ≥14.15.0 – <14.17.5 |
| nodejs | node.js | * | ≥16.0.0 – <16.6.2 |
| pgbouncer | pgbouncer | * | ≤1.17.0 |
References 5
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1988342
- c-ares.haxx.se https://c-ares.haxx.se/adv_20210810.html
- cert-portal.siemens.com https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- security.gentoo.org https://security.gentoo.org/glsa/202401-02
- oracle.com https://www.oracle.com/security-alerts/cpujul2022.html
Remediation
- c-ares.haxx.se https://c-ares.haxx.se/adv_20210810.html
- cert-portal.siemens.com https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf