CVE-2021-4248 json
kapetan dns Request.cs entropy
published 2022-12-18 3 y ago modified 2026-06-17 4 mo ago also GHSA-g3wc-xv93-445q , EUVD-2022-7624
- cvss
- 5.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- nuget DNS 7.0.0
- kapetan_dns_project kapetan_dns 7.0.0
- github.com/kapetan/dns@cf7105a commit
- github.com/kapetan/dns#88 pull request
- github.com/kapetan/dns/releases/tag/v7.0.0 release
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
0.81% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.6 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | DNS | <7.0.0 |
7.0.0 |
Affected products
- kapetan dns
Classification
- Weakness
-
- CWE-330 Use of Insufficiently Random Values
References
-
github.com
/kapetan/dns/pull/88
web, patch, third-party-advisory
-
github.com
/kapetan/dns/commit/cf7105aa2aae90d6656088fe5a8ee1d5730773b6
web, patch, third-party-advisory
-
github.com
/kapetan/dns/releases/tag/v7.0.0
web, release-notes, third-party-advisory
-
vuldb.com
/?id.216188
web, permissions-required, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-4248
advisory
-
github.com
/kapetan/dns
package
Sources
- CVE List CVE-2021-4248
- GitHub Advisory GHSA-g3wc-xv93-445q
- NVD CVE-2021-4248
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