c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
CVSS Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade c-ares-develUpgrade nodejs-develUpgrade nodejs-nodemonUpgrade nodejs-docsUpgrade nodejs-full-i18nUpgrade nodejs-libsUpgrade nodejs-packaging-bundlerUpgrade npmUpgrade nodejs-packagingUpgrade nodejsUpgrade c-ares | Jun 27, 2023 | May 25, 2023 |
| Amazon Linux Ami 2 | — | Upgrade c-ares-debuginfoUpgrade ecs-service-connect-agentUpgrade c-aresUpgrade c-ares-devel | Sep 28, 2023 | May 25, 2023 |
| Amazon_linux_2023 | — | Upgrade c-ares-debuginfoUpgrade c-aresUpgrade ecs-service-connect-agentUpgrade c-ares-develUpgrade c-ares-debugsource | Feb 17, 2025 | May 22, 2023 |
| Centos_linux | — | Upgrade nodejsUpgrade c-ares-develUpgrade npmUpgrade c-ares-debugsourceUpgrade nodejs-full-i18nUpgrade nodejs-debugsourceUpgrade nodejs-libsUpgrade nodejs-packagingUpgrade nodejs-nodemonUpgrade nodejs-develUpgrade nodejs-debuginfoUpgrade nodejs-libs-debuginfoUpgrade c-aresUpgrade c-ares-debuginfoUpgrade nodejs-docsUpgrade nodejs-packaging-bundler | Jun 15, 2023 | May 25, 2023 |
| Debian | — | Upgrade c-ares | May 15, 2025 | May 25, 2023 |
| Gentoo Linux | — | Upgrade net-dns/c-ares. | Oct 10, 2023 | May 25, 2023 |
| Huawei Euleros 2_0_sp10 | — | Upgrade c-ares | Jan 10, 2024 | May 25, 2023 |
| Huawei Euleros 2_0_sp11 | — | Upgrade c-ares | Jan 10, 2024 | May 25, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade c-aresUpgrade c-ares-devel | Jan 10, 2024 | May 25, 2023 |
| Huawei Euleros 2_0_sp9 | — | Upgrade c-ares | Aug 9, 2023 | May 25, 2023 |
| Oracle_linux | — | Upgrade nodejs-develUpgrade npmUpgrade c-aresUpgrade c-ares-develUpgrade nodejsUpgrade nodejs-libsUpgrade nodejs-packagingUpgrade nodejs-full-i18nUpgrade nodejs-packaging-bundlerUpgrade nodejs-nodemonUpgrade nodejs-docs | Jun 15, 2023 | May 22, 2023 |
| Redhat_linux | — | Upgrade c-aresUpgrade nodejs-nodemonUpgrade c-ares-debuginfoUpgrade c-ares-debugsourceUpgrade nodejs-develUpgrade nodejs-debuginfoUpgrade npmUpgrade nodejs-packaging-bundlerUpgrade nodejs-libsUpgrade nodejs-packagingUpgrade nodejs-libs-debuginfoUpgrade nodejs-debugsourceUpgrade nodejs-full-i18nUpgrade nodejs-docsNo solution existsUpgrade c-ares-develUpgrade nodejs | Jun 15, 2023 | May 25, 2023 |
| Rocky_linux | — | Upgrade nodejsUpgrade npmUpgrade nodejs-debuginfoUpgrade nodejs-full-i18nUpgrade nodejs-develUpgrade nodejs-debugsource | Mar 5, 2024 | May 25, 2023 |
| Suse | — | Upgrade libcares2-32bitUpgrade nodejs18-docsUpgrade corepack18Upgrade libcares-develUpgrade npm16Upgrade nodejs18Upgrade nodejs16-docsUpgrade c-ares-utilsUpgrade nodejs16Upgrade npm18Upgrade libcares2Upgrade nodejs18-develUpgrade c-ares-develUpgrade nodejs16-develUpgrade corepack16 | May 31, 2023 | May 25, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | May 25, 2023 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub