Is CVE-2024-33655 in the CISA KEV catalog?

No. CVE-2024-33655 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-33655?

CVE-2024-33655 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2024-33655?

CVE-2024-33655 has an EPSS score of 1.73% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-33655?

Upgrade unbound on debian 11 to 1.13.1-1+deb11u5 or later. Fixes are available for 29 affected products.

CVE & CISA-KEV Catalog

CVE-2024-33655

HIGHEPSS 75th pctl

7.5

CVSS v3

NVD

Description

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.

CWE-400Resource Exhaustion

How to fix

Remediation Available

unboundDebian

Fixed in:1.13.1-1+deb11u5CVE-2024-33655

Fixed in:1.17.1-2+deb12u3CVE-2024-33655

Fixed in:1.20.0-1CVE-2024-33655

python3-unboundRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

python3-unboundRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

python3-unbound-debuginfoRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

python3-unbound-debuginfoRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unboundRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unboundRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-anchorRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

unbound-anchorRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

unbound-anchor-debuginfoRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

unbound-anchor-debuginfoRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

unbound-debuginfoRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-debuginfoRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-debugsourceRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-debugsourceRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-develRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-develRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-dracutRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-dracutRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-libsRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-libsRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-libs-debuginfoRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-libs-debuginfoRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

Fixed in:0:1.24.2-2.el9RHSA-2026:18931

unbound-utilsRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

unbound-utilsRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

unbound-utils-debuginfoRed Hat / RHEL

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

unbound-utils-debuginfoRocky

Fixed in:0:1.24.2-7.el10RHSA-2026:18556

libunbound8Ubuntu

Fixed in:1.9.4-2ubuntu1.6USN-6791-1

Fixed in:1.13.1-1ubuntu5.5USN-6791-1

Fixed in:1.17.1-2ubuntu0.2USN-6791-1

Fixed in:1.19.2-1ubuntu3.1USN-6791-1

unboundUbuntu

Fixed in:1.9.4-2ubuntu1.6USN-6791-1

Fixed in:1.13.1-1ubuntu5.5USN-6791-1

Fixed in:1.17.1-2ubuntu0.2USN-6791-1

Fixed in:1.19.2-1ubuntu3.1USN-6791-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

1.73%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Other references15

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.