CVE-2024-33655

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-06-06 · updated 2026-06-17
Weakness: CWE-400

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.

Affected products

Technitium DNS Server: through 1.19.3

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/

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