CVE-2024-33655
libunbound8: The DNS protocol in RFC 1035 and updates allows remote attackers to cause adenial of service (resource consumption) b...
CVE-2024-33655 is fixed in 16 products on 1 platform, first by libunbound8 1.9.4-2ubuntu1.6, released May 9, 2024. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Low
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0174
77th percentile
The DNS protocol in RFC 1035 and updates allows remote attackers to cause adenial of service (resource consumption) by arranging for DNS queries to beaccumulated for seconds, such that responses are later sent in a pulsingburst (which can be considered traffic amplification in some cases), akathe "DNSBomb" issue.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libunbound8 · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.6 | libunbound8 1.9.4-2ubuntu1.6 | May 9, 2024 |
| libunbound8 · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.5 | libunbound8 1.13.1-1ubuntu5.5 | May 9, 2024 |
| libunbound8 · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.1 | libunbound8 1.19.2-1ubuntu3.1 | May 9, 2024 |
| libunbound8 · Ubuntu 24.10 (oracular) | 1.20.0-1ubuntu1 | libunbound8 1.20.0-1ubuntu1 | May 10, 2024 |
| libunbound8 · Ubuntu 25.04 (plucky) | 1.20.0-1ubuntu1 | libunbound8 1.20.0-1ubuntu1 | May 10, 2024 |
| python-unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.6 | python-unbound 1.9.4-2ubuntu1.6 | May 9, 2024 |
| python3-unbound · RHEL 9 | 0:1.24.2-2.el9 | RHSA-2026:18931 | May 27, 2026 |
| python3-unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.6 | python3-unbound 1.9.4-2ubuntu1.6 | May 9, 2024 |
| python3-unbound · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.5 | python3-unbound 1.13.1-1ubuntu5.5 | May 9, 2024 |
| python3-unbound · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.1 | python3-unbound 1.19.2-1ubuntu3.1 | May 9, 2024 |
| python3-unbound · Ubuntu 24.10 (oracular) | 1.20.0-1ubuntu1 | python3-unbound 1.20.0-1ubuntu1 | May 10, 2024 |
| python3-unbound · Ubuntu 25.04 (plucky) | 1.20.0-1ubuntu1 | python3-unbound 1.20.0-1ubuntu1 | May 10, 2024 |
| python3-unbound · almalinux 10 | 1.24.2-7.el10 | ALSA-2026:18556 | May 19, 2026 |
| python3-unbound · almalinux 9 | 1.24.2-2.el9 | ALSA-2026:18931 | May 19, 2026 |
| python3-unbound · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| python3-unbound · ol 10 | 0:1.24.2-7.el10 | ELSA-2026-18556 | Jul 8, 2026 |
| python3-unbound · ol 9 | 0:1.24.2-2.el9 | ELSA-2026-18931 | Jun 12, 2026 |
| python3-unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound · Debian 11.6 (bullseye) | 1.13.1-1+deb11u5 | DLA-4280-1 | Aug 24, 2025 |
| unbound · Debian 12.15 (bookworm) | 1.17.1-2+deb12u3 | DSA-5987-1 | Aug 27, 2025 |
| unbound · Debian 13.5 (trixie) | 1.20.0-1 | DEBIAN-CVE-2024-33655 | Jun 6, 2024 |
| unbound · Debian 14 | 1.20.0-1 | DEBIAN-CVE-2024-33655 | Jun 6, 2024 |
| unbound · RHEL 9 | 0:1.24.2-2.el9 | RHSA-2026:18931 | May 27, 2026 |
| unbound · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.6 | unbound 1.9.4-2ubuntu1.6 | May 9, 2024 |
| unbound · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.5 | unbound 1.13.1-1ubuntu5.5 | May 9, 2024 |
| unbound · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.1 | unbound 1.19.2-1ubuntu3.1 | May 9, 2024 |
| unbound · Ubuntu 24.10 (oracular) | 1.20.0-1ubuntu1 | unbound 1.20.0-1ubuntu1 | May 10, 2024 |
| unbound · Ubuntu 25.04 (plucky) | 1.20.0-1ubuntu1 | unbound 1.20.0-1ubuntu1 | May 10, 2024 |
| unbound · almalinux 10 | 1.24.2-7.el10 | ALSA-2026:18556 | May 19, 2026 |
| unbound · almalinux 9 | 1.24.2-2.el9 | ALSA-2026:18931 | May 19, 2026 |
| unbound · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound · ol 10 | 0:1.24.2-7.el10 | ELSA-2026-18556 | Jul 8, 2026 |
| unbound · ol 9 | 0:1.24.2-2.el9 | ELSA-2026-18931 | Jun 12, 2026 |
| unbound · rocky 10 | 0:1.24.2-7.el10 | RLSA-2026:18556 | May 29, 2026 |
| unbound · rocky 9 | 0:1.24.2-2.el9 | RLSA-2026:18931 | May 28, 2026 |
| unbound-anchor · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.6 | unbound-anchor 1.9.4-2ubuntu1.6 | May 9, 2024 |
| unbound-anchor · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.5 | unbound-anchor 1.13.1-1ubuntu5.5 | May 9, 2024 |
| unbound-anchor · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.1 | unbound-anchor 1.19.2-1ubuntu3.1 | May 9, 2024 |
| unbound-anchor · Ubuntu 24.10 (oracular) | 1.20.0-1ubuntu1 | unbound-anchor 1.20.0-1ubuntu1 | May 10, 2024 |
| unbound-anchor · Ubuntu 25.04 (plucky) | 1.20.0-1ubuntu1 | unbound-anchor 1.20.0-1ubuntu1 | May 10, 2024 |
| unbound-anchor · almalinux 10 | 1.24.2-7.el10 | ALSA-2026:18556 | May 19, 2026 |
| unbound-anchor · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-anchor · ol 10 | 0:1.24.2-7.el10 | ELSA-2026-18556 | Jul 8, 2026 |
| unbound-anchor-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-debugsource · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-devel · RHEL 9 | 0:1.24.2-2.el9 | RHSA-2026:18931 | May 27, 2026 |
| unbound-devel · almalinux 10 | 1.24.2-7.el10 | ALSA-2026:18556 | May 19, 2026 |
| unbound-devel · almalinux 9 | 1.24.2-2.el9 | ALSA-2026:18931 | May 19, 2026 |
| unbound-devel · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-devel · ol 10 | 0:1.24.2-7.el10 | ELSA-2026-18556 | Jul 8, 2026 |
| unbound-devel · ol 9 | 0:1.24.2-2.el9 | ELSA-2026-18931 | Jun 12, 2026 |
| unbound-dracut · RHEL 9 | 0:1.24.2-2.el9 | RHSA-2026:18931 | May 27, 2026 |
| unbound-dracut · almalinux 10 | 1.24.2-7.el10 | ALSA-2026:18556 | May 19, 2026 |
| unbound-dracut · almalinux 9 | 1.24.2-2.el9 | ALSA-2026:18931 | May 19, 2026 |
| unbound-dracut · ol 10 | 0:1.24.2-7.el10 | ELSA-2026-18556 | Jul 8, 2026 |
| unbound-dracut · ol 9 | 0:1.24.2-2.el9 | ELSA-2026-18931 | Jun 12, 2026 |
| unbound-host · Ubuntu 20.04 LTS (focal) | 1.9.4-2ubuntu1.6 | unbound-host 1.9.4-2ubuntu1.6 | May 9, 2024 |
| unbound-host · Ubuntu 22.04.1 LTS (jammy) | 1.13.1-1ubuntu5.5 | unbound-host 1.13.1-1ubuntu5.5 | May 9, 2024 |
| unbound-host · Ubuntu 24.04.5 LTS (noble) | 1.19.2-1ubuntu3.1 | unbound-host 1.19.2-1ubuntu3.1 | May 9, 2024 |
| unbound-host · Ubuntu 24.10 (oracular) | 1.20.0-1ubuntu1 | unbound-host 1.20.0-1ubuntu1 | May 10, 2024 |
| unbound-host · Ubuntu 25.04 (plucky) | 1.20.0-1ubuntu1 | unbound-host 1.20.0-1ubuntu1 | May 10, 2024 |
| unbound-libs · RHEL 9 | 0:1.24.2-2.el9 | RHSA-2026:18931 | May 27, 2026 |
| unbound-libs · almalinux 10 | 1.24.2-7.el10 | ALSA-2026:18556 | May 19, 2026 |
| unbound-libs · almalinux 9 | 1.24.2-2.el9 | ALSA-2026:18931 | May 19, 2026 |
| unbound-libs · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-libs · ol 10 | 0:1.24.2-7.el10 | ELSA-2026-18556 | Jul 8, 2026 |
| unbound-libs · ol 9 | 0:1.24.2-2.el9 | ELSA-2026-18931 | Jun 12, 2026 |
| unbound-libs-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-utils · almalinux 10 | 1.24.2-7.el10 | ALSA-2026:18556 | May 19, 2026 |
| unbound-utils · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
| unbound-utils · ol 10 | 0:1.24.2-7.el10 | ELSA-2026-18556 | Jul 8, 2026 |
| unbound-utils-debuginfo · amzn 2023 | 1.17.1-1.amzn2023.0.4 | ALAS2023-2024-610 | May 9, 2024 |
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