CVE-2024-33655
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of service disruption.
- Exploit odds
- 1.7% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 1.7% in the next 30 days (EPSS).
- Severity: 7.5 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 1.7% · EPSS, next 30 days
- Weakness
- CWE-400 · Uncontrolled resource consumption
- Record status
- Deferred
Attack profile CVSS 3.1 · 7.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2024-33655.md and follow it. Check whether this project is affected by CVE-2024-33655. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/NLnetLabs/unbound/commit/c3206f4568f60c486be6d165b1f2b5b254fea3de
- https://github.com/NLnetLabs/unbound/commit/c3206f4568f60c486be6d165b1f2b5b254fea3de
References
- https://alas.aws.amazon.com/ALAS-2024-1934.html
- https://datatracker.ietf.org/doc/html/rfc1035
- https://github.com/NLnetLabs/unbound/commit/c3206f4568f60c486be6d165b1f2b5b254fea3de
- https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-120
- https://gitlab.isc.org/isc-projects/bind9/-/issues/4398
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/
- https://meterpreter.org/researchers-uncover-dnsbomb-a-new-pdos-attack-exploiting-legitimate-dns-features/
- https://nlnetlabs.nl/downloads/unbound/CVE-2024-33655.txt
- https://nlnetlabs.nl/projects/unbound/security-advisories/
- https://sp2024.ieee-security.org/accepted-papers.html
- https://www.isc.org/blogs/2024-dnsbomb/
- https://alas.aws.amazon.com/ALAS-2024-1934.html
- https://datatracker.ietf.org/doc/html/rfc1035
- https://github.com/NLnetLabs/unbound/commit/c3206f4568f60c486be6d165b1f2b5b254fea3de
- https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-120
- https://gitlab.isc.org/isc-projects/bind9/-/issues/4398
- https://lists.debian.org/debian-lts-announce/2025/08/msg00019.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/3TBXPRJ2Q235YUZKYDRWOSYNDFBJQWJ3/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/QITY2QBX2OCBTZIXD2A5ES62STFIA4AL/
- https://meterpreter.org/researchers-uncover-dnsbomb-a-new-pdos-attack-exploiting-legitimate-dns-features/
- https://nlnetlabs.nl/downloads/unbound/CVE-2024-33655.txt
- https://nlnetlabs.nl/projects/unbound/security-advisories/