CVE-2021-4248

Name: CVE-2021-4248
Creator: NVD / NIST
Published: 2022-12-18T11:15:09.893+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.75%

Last modified Jun 17, 2026

CVE-2021-4248 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. EPSS estimates a 0.75% chance of exploitation in the next 30 days.

Description

A vulnerability was found in kapetan dns up to 6.1.0. It has been rated as problematic. Affected by this issue is some unknown functionality of the file DNS/Protocol/Request.cs. The manipulation leads to insufficient entropy in prng. The attack may be launched remotely. Upgrading to version 7.0.0 is able to address this issue. The name of the patch is cf7105aa2aae90d6656088fe5a8ee1d5730773b6. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-216188.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.75%

50.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-330

Affected Software

Vendor	Product	Versions
Kapetan Dns Project	Kapetan Dns	< 7.0.0

References

https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6Patch, Third Party Advisory
https://github.com/kapetan/dns/pull/88Patch, Third Party Advisory
https://github.com/kapetan/dns/releases/tag/v7.0.0Release Notes, Third Party Advisory
https://vuldb.com/?id.216188Permissions Required, Third Party Advisory
https://github.com/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6Patch, Third Party Advisory
https://github.com/kapetan/dns/pull/88Patch, Third Party Advisory
https://github.com/kapetan/dns/releases/tag/v7.0.0Release Notes, Third Party Advisory
https://vuldb.com/?id.216188Permissions Required, Third Party Advisory

Timeline

Published: Dec 18, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4248?

How severe is CVE-2021-4248?

CVE-2021-4248 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.75% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4248?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4248?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST