CVE-2023-32067— 0-byte UDP payload DoS in c-ares
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I. Basic Information for CVE-2023-32067
Vulnerability Information
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Vulnerability Title
0-byte UDP payload DoS in c-ares
Source: NVD (National Vulnerability Database)
Vulnerability Description
c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
c-ares 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
c-ares是c-ares个人开发者的一个用于异步 DNS 请求的 C 库。 c-ares 1.19.1之前版本存在安全漏洞，该漏洞源于容易受到拒绝服务攻击。
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
II. Public POCs for CVE-2023-32067
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- https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1x_refsource_MISC
- https://github.com/c-ares/c-ares/security/advisories/GHSA-9g78-jv2r-p7vcx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2023-32067
Same Patch Batch · c-ares · 2023-05-25 · 4 CVEs total
| CVE-2023-31147 | 5.9 MEDIUM | Insufficient randomness in generation of DNS query IDs in c-ares |
| CVE-2023-31130 | 4.1 MEDIUM | Buffer Underwrite in ares_inet_net_pton() |
| CVE-2023-31124 | 3.7 LOW | AutoTools does not set CARES_RANDOM_FILE during cross compilation |
IV. Related Vulnerabilities
Same product: c-ares
- 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() - CVE-2024-25629
c-ares out of bounds read in ares__read_line() - CVE-2023-31147
Insufficient randomness in generation of DNS query IDs in c- - CVE-2023-31130
Buffer Underwrite in ares_inet_net_pton()
Same vendor: c-ares
- 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() - CVE-2024-25629
c-ares out of bounds read in ares__read_line() - CVE-2023-31147
Insufficient randomness in generation of DNS query IDs in c- - CVE-2023-31130
Buffer Underwrite in ares_inet_net_pton()
Same weakness: CWE-400
- CVE-2026-8187
Open5GS UPF gtp-path.c _gtpv1_u_recv_cb resource consumption - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo - CVE-2026-42212
SolidCAM-GPPL-IDE: XML External Entity (XXE) and billion-lau - CVE-2026-32686
Unbounded exponent in decimal enables unauthenticated DoS - CVE-2026-20188
Cisco Crosswork Network Controller and Cisco Network Service
V. Comments for CVE-2023-32067
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