CVE-2021-43105
A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that...
A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that allows specific malicious users to inject NS records of any domain (even TLDs) into the cache and conduct a DNS cache poisoning attack.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that allows specific malicious users to inject NS records of any domain (even TLDs) into the cache and conduct a DNS cache poisoning attack.
- Record
CVE-2021-43105- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - CVSS 2.0
- 4.0 Medium
AV:N/AC:L/Au:S/C:N/I:P/A:N - Updated
- 2026-11-02
CVE List No score
A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that allows specific malicious users to inject NS records of any domain (even TLDs) into the cache and conduct a DNS cache poisoning attack.
- Record
CVE-2021-43105- Updated
- 2026-11-02
EUVDEUVD-2021-30056 No score
A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that allows specific malicious users to inject NS records of any domain (even TLDs) into the cache and conduct a DNS cache poisoning attack.
- Record
EUVD-2021-30056- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fh5j-qj82-2m8v
A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that...
A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that allows specific malicious users to inject NS records of any domain (even TLDs) into the cache and conduct a DNS cache poisoning attack.
- Record
GHSA-fh5j-qj82-2m8v- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-43105 is a medium vulnerability (CVSS 4.3) in Technitium Dns Server, published March 28, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. No source names a fixed version.