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Fencer Vulns
high 7.5

CVE-2024-33655 json

The DNS protocol in RFC 1035 and updates allows remote attackers to cause a denial of service (resource consumption) by arranging for DNS q…

published 2024-06-06 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-31371

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

The DNS protocol in RFC 1035 and updates allows remote attackers to cause a denial of service (resource consumption) by arranging for DNS queries to be accumulated for seconds, such that responses are later sent in a pulsing burst (which can be considered traffic amplification in some cases), aka the "DNSBomb" issue.

Patch / fix

  • nlnetlabs unbound 1.20.0
  • technitium dnsserver 12.0
  • unbound Debian 12 1.17.1-2+deb12u3
  • unbound Debian 14, Debian 13 1.20.0-1

debian advisories DEBIAN-CVE-2024-33655

  • unbound Ubuntu 20.04 LTS 1.9.4-2ubuntu1.6
  • unbound Ubuntu 22.04 LTS 1.13.1-1ubuntu5.5
  • unbound Ubuntu 24.04 LTS 1.19.2-1ubuntu3.1

ubuntu advisories UBUNTU-CVE-2024-33655

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • unbound RHEL 9 1.24.2-2.el9
  • unbound-libs RHEL 9 1.24.2-2.el9
  • unbound-dracut RHEL 9 1.24.2-2.el9
  • python3-unbound RHEL 9 1.24.2-2.el9
  • unbound RHEL 10.2 1.24.2-7.el10
  • unbound-libs RHEL 10.2 1.24.2-7.el10
  • unbound-utils RHEL 10.2 1.24.2-7.el10
  • unbound-anchor RHEL 10.2 1.24.2-7.el10

red hat advisories RHSA-2026:18931RHSA-2026:18556

  • unbound Linux Micro 6.0 1.21.0-1.1

suse advisories SUSE-SU-2025:20024-1

  • unbound openSUSE Tumbleweed 1.20.0-1.1

opensuse advisories openSUSE-SU-2024:13944-1

  • unbound AlmaLinux 10 1.24.2-7.el10
  • unbound-libs AlmaLinux 10 1.24.2-7.el10
  • unbound-utils AlmaLinux 10 1.24.2-7.el10
  • unbound-anchor AlmaLinux 10 1.24.2-7.el10
  • unbound-dracut AlmaLinux 10 1.24.2-7.el10
  • python3-unbound AlmaLinux 10 1.24.2-7.el10
  • unbound AlmaLinux 9 1.24.2-2.el9
  • unbound-libs AlmaLinux 9 1.24.2-2.el9

almalinux advisories ALSA-2026:18556ALSA-2026:18931

  • unbound Rocky Linux 10 1.24.2-7.el10
  • unbound Rocky Linux 9 1.24.2-2.el9

rocky linux advisories RLSA-2026:18556RLSA-2026:18931

  • unbound Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 1.20.0-r0

alpine advisories ALPINE-CVE-2024-33655

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • unbound CBL-Mariner 2.0, Azure Linux 3.0 1.19.1-3

azure linux advisories AZL-42447AZL-42490

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-33655 updated cvss 3.7

unbound: DNSBomb vulnerability

  • Red Hat Enterprise Linux 6 unbound, unbound-libs, unbound-python Red Hat Enterprise Linux 7 unbound, unbound-libs, unbound-python
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 unbound, unbound-libs, python3-unbound
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux AppStream (v. 9) unbound 1.24.2-2.el9, unbound-libs 1.24.2-2.el9, unbound-dracut 1.24.2-2.el9, python3-unbound 1.24.2-2.el9
    fixed: vendor fix RHSA-2026:18931
  • Red Hat Enterprise Linux AppStream (v. 10) unbound 1.24.2-7.el10, unbound-libs 1.24.2-7.el10, unbound-utils 1.24.2-7.el10, unbound-anchor 1.24.2-7.el10, unbound-dracut 1.24.2-7.el10, python3-unbound 1.24.2-7.el10
    fixed: vendor fix RHSA-2026:18556
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) unbound-devel 1.24.2-2.el9, unbound-debuginfo 1.24.2-2.el9, unbound-debugsource 1.24.2-2.el9, unbound-libs-debuginfo 1.24.2-2.el9, python3-unbound-debuginfo 1.24.2-2.el9
    fixed: vendor fix RHSA-2026:18931
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) unbound-devel 1.24.2-7.el10, unbound-debuginfo 1.24.2-7.el10, unbound-debugsource 1.24.2-7.el10, unbound-libs-debuginfo 1.24.2-7.el10, unbound-utils-debuginfo 1.24.2-7.el10, unbound-anchor-debuginfo 1.24.2-7.el10, +1 more
    fixed: vendor fix RHSA-2026:18556

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.74% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • technitium dns_server

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.