What is CVE-2020-26133?

CVE-2020-26133 is a high-severity vulnerability in Dual Dhcp DNS Server Project, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2020-10-28.

How severe is CVE-2020-26133?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Dual Dhcp DNS Server Project

CVE-2020-26133

An issue was discovered in Dual DHCP DNS Server 7.40. Due to insufficient access restrictions in the default installation directory, an attacker can elevate privileges by replacing the DualServer.exe binary.

Published 2020-10-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (23.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Dual Dhcp DNS Server Project — versions 7.40

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

sourceforge.net/projects/dhcp-dns-server/ (Product)
github.com/an0ry/advisories (Third Party Advisory)
github.com/OffensiveOceloot/advisories/blob/main/CVE-2020-26133.md

Frequently asked questions

What is CVE-2020-26133?: CVE-2020-26133 is a high-severity vulnerability in Dual Dhcp DNS Server Project, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 7.8/10. Published 2020-10-28.
How severe is CVE-2020-26133?: High severity. CVSS v3 base score is 7.8 out of 10.