How severe is CVE-2023-49203?

CVE-2023-49203 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-49203 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-49203?

CVE-2023-49203 affects Technitium Dnsserver. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-49203?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-49203 have an EU (EUVD) identifier?

Yes. CVE-2023-49203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-53207.

When was CVE-2023-49203 published?

CVE-2023-49203 was published on 2024-09-18 and last updated on 2026-06-17.

CVE-2023-49203

CVE-2023-49203 is a high-severity vulnerability in Technitium Dnsserver with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-406.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-53207
Weakness: CWE-406
Affected product: Technitium Dnsserver
Published: 2024-09-18
Last modified: 2026-06-17

Description

Technitium 11.5.3 allows remote attackers to cause a denial of service (bandwidth amplification) because the DNSBomb manipulation causes accumulation of low-rate DNS queries such that there is a large-sized response in a burst of traffic.

Frequently asked questions

What is CVE-2023-49203?: Technitium 11.5.3 allows remote attackers to cause a denial of service (bandwidth amplification) because the DNSBomb manipulation causes accumulation of low-rate DNS queries such that there is a large-sized response in a burst of traffic.
How severe is CVE-2023-49203?: CVE-2023-49203 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-49203 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-49203?: CVE-2023-49203 affects Technitium Dnsserver. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-49203?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-49203 have an EU (EUVD) identifier?: Yes. CVE-2023-49203 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-53207.
When was CVE-2023-49203 published?: CVE-2023-49203 was published on 2024-09-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:technitium:dnsserver:11.5.3:*:*:*:*:*:*:*

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CVE-2023-28455 — High (CVSS 7.5): An issue was discovered in Technitium through 11.0.2. The forwarding mode enables attackers to create a query loop…
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