CVE-2019-25031

Name: CVE-2019-25031
Creator: NVD / NIST
Published: 2021-04-27T06:15:07.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2019-25031 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. Unbound before 1.9.5 allows configuration injection in create_unbound_ad_servers.sh upon a successful man-in-the-middle attack against a cleartext HTTP session. NOTE: The vendor does not consider this a vulnerability of the Unbound software. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

Unbound before 1.9.5 allows configuration injection in create_unbound_ad_servers.sh upon a successful man-in-the-middle attack against a cleartext HTTP session. NOTE: The vendor does not consider this a vulnerability of the Unbound software. create_unbound_ad_servers.sh is a contributed script from the community that facilitates automatic configuration creation. It is not part of the Unbound installation

Metrics

CVSS 3.1

5.9/10

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

EPSS Probability

1.34%

67.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Nlnetlabs	Unbound	< 1.9.5
Debian	Debian Linux	9.0

References

https://lists.debian.org/debian-lts-announce/2021/05/msg00007.htmlMailing List, Third Party Advisory
https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/Not Applicable, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210507-0007/Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00007.htmlMailing List, Third Party Advisory
https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/Not Applicable, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210507-0007/Third Party Advisory

Timeline

Published: Apr 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-25031?

How severe is CVE-2019-25031?

CVE-2019-25031 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2019-25031?

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-2019-25031?

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

Scan your code now

Source: NVD / NIST