CVE-2024-33655

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.74% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 75.8% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2024-06-06 00:00Z2 YR AGO

Last updated

2025-11-04 22:06Z10 MO AGO

Reserved

2024-04-25

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.2

Document digest

074a64777c2b5d01585c6ce3619075ea8d926ca4dbd628fd62ec1f9064f61ce9

• datatracker.ietf.orghttps://datatracker.ietf.org/doc/html/rfc1035
• nlnetlabs.nlhttps://nlnetlabs.nl/projects/unbound/security-advisories/
• github.comhttps://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-120
• www.isc.orghttps://www.isc.org/blogs/2024-dnsbomb/
• nlnetlabs.nlhttps://nlnetlabs.nl/downloads/unbound/CVE-2024-33655.txt
• github.comhttps://github.com/NLnetLabs/unbound/commit/c3206f4568f60c486be6d165b1f2b5b254fea3de
• alas.aws.amazon.comhttps://alas.aws.amazon.com/ALAS-2024-1934.html
• meterpreter.orghttps://meterpreter.org/researchers-uncover-dnsbomb-a-new-pdos-attack-exploiting-legitimate-dns-features/
• sp2024.ieee-security.orghttps://sp2024.ieee-security.org/accepted-papers.html
• gitlab.isc.orghttps://gitlab.isc.org/isc-projects/bind9/-/issues/4398
• lists.fedoraproject.orgFEDORA-2024-9df760819chttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/vendor-advisory
• lists.fedoraproject.orgFEDORA-2024-68626e0eb5https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/vendor-advisory
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/08/msg00019.html
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/
• lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/