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-docsUpgrade nodejs-nodemonUpgrade nodejs-full-i18nUpgrade nodejs-libsUpgrade nodejs-develUpgrade nodejs-packagingUpgrade nodejs-packaging-bundlerUpgrade c-aresUpgrade npmUpgrade nodejs | Jun 27, 2023 | May 25, 2023 |
| Amazon Linux Ami 2 | — | Upgrade c-ares-debuginfoUpgrade c-aresUpgrade ecs-service-connect-agentUpgrade c-ares-devel | Sep 28, 2023 | May 25, 2023 |
| Amazon_linux_2023 | — | Upgrade c-ares-debuginfoUpgrade c-aresUpgrade c-ares-develUpgrade c-ares-debugsourceUpgrade ecs-service-connect-agent | Feb 17, 2025 | May 22, 2023 |
| Centos_linux | — | Upgrade nodejs-packaging-bundlerUpgrade c-ares-debuginfoUpgrade nodejs-libs-debuginfoUpgrade nodejs-docsUpgrade nodejs-develUpgrade nodejs-debuginfoUpgrade c-aresUpgrade nodejsUpgrade c-ares-develUpgrade npmUpgrade c-ares-debugsourceUpgrade nodejs-libsUpgrade nodejs-full-i18nUpgrade nodejs-packagingUpgrade nodejs-nodemonUpgrade nodejs-debugsource | 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 nodejs-libsUpgrade nodejsUpgrade nodejs-full-i18nUpgrade nodejs-packaging-bundlerUpgrade nodejs-packagingUpgrade nodejs-docsUpgrade nodejs-nodemon | Jun 15, 2023 | May 22, 2023 |
| Redhat_linux | — | Upgrade c-ares-debugsourceUpgrade nodejs-nodemonUpgrade nodejs-debuginfoUpgrade c-ares-debuginfoUpgrade c-aresUpgrade npmUpgrade nodejs-develUpgrade nodejs-packaging-bundlerUpgrade nodejsUpgrade nodejs-libsUpgrade nodejs-debugsourceUpgrade nodejs-full-i18nNo solution existsUpgrade c-ares-develUpgrade nodejs-docsUpgrade nodejs-libs-debuginfoUpgrade nodejs-packaging | Jun 15, 2023 | May 25, 2023 |
| Rocky_linux | — | Upgrade nodejs-debugsourceUpgrade nodejs-develUpgrade nodejs-full-i18nUpgrade npmUpgrade nodejs-debuginfoUpgrade nodejs | Mar 5, 2024 | May 25, 2023 |
| Suse | — | Upgrade npm18Upgrade nodejs16-develUpgrade corepack16Upgrade nodejs18-develUpgrade c-ares-utilsUpgrade c-ares-develUpgrade libcares2Upgrade nodejs16Upgrade nodejs16-docsUpgrade nodejs18-docsUpgrade npm16Upgrade nodejs18Upgrade libcares-develUpgrade corepack18Upgrade libcares2-32bit | 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