CVE-2021-3672
Quick assessment
Affected
n/a c-ares
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
libcares2是openSUSE项目的一个 C 库，可以异步执行 DNS 请求和名称解析。 libcares2 存在跨站脚本漏洞，该漏洞源于对主机名的输入验证不当。
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I. Basic Information for CVE-2021-3672
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
libcares2 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcares2是openSUSE项目的一个 C 库，可以异步执行 DNS 请求和名称解析。 libcares2 存在跨站脚本漏洞，该漏洞源于对主机名的输入验证不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | c-ares | c-ares 1.17.2 | - |
|
II. Public POCs for CVE-2021-3672
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2021-3672 (4)
-
https://bugzilla.redhat.com/show_bug.cgi?id=1988342 x_refsource_MISC
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https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf x_refsource_CONFIRM
-
https://www.oracle.com/security-alerts/cpujul2022.html x_refsource_MISC
-
https://security.gentoo.org/glsa/202401-02 vendor-advisory
Other References for CVE-2021-3672 (1)
-
https://c-ares.haxx.se/adv_20210810.html x_refsource_MISC
Same Patch Batch · n/a · 2021-11-23 · 8 CVEs total
| CVE-2021-20601 | Mitsubishi Electric Got 输入验证错误漏洞 | |
| CVE-2021-39976 | Huawei Cloudengine 5800 安全漏洞 | |
| CVE-2021-22410 | Huawei IMaster Nce-Fabric 跨站脚本漏洞 | |
| CVE-2021-37036 | FusionCompute 信息泄露漏洞 | |
| CVE-2021-37102 | Huawei FusionCompute 命令注入漏洞 | |
| CVE-2021-22356 | 多款华为产品加密问题漏洞 | |
| CVE-2021-35052 | Kaspersky Password Manager 安全漏洞 |
IV. Related Vulnerabilities
Same product: c-ares
-
CVE-2026-69184
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CVE-2026-33630
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CVE-2025-62408
c-ares has a Use After Free vulnerability when connection is -
CVE-2025-31498
c-ares has a use-after-free in read_answers()
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V. Comments for CVE-2021-3672
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