CVE-2019-25037

Name: CVE-2019-25037
Creator: NVD / NIST
Published: 2021-04-27T06:15:07.617+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.13%

Last modified Jun 17, 2026

CVE-2019-25037 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Unbound before 1.9.5 allows an assertion failure and denial of service in dname_pkt_copy via an invalid packet. NOTE: The vendor disputes that this is a vulnerability. EPSS estimates a 2.13% chance of exploitation in the next 30 days.

Description

Unbound before 1.9.5 allows an assertion failure and denial of service in dname_pkt_copy via an invalid packet. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.13%

79.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

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/Patch, 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/Patch, 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-2019-25037?

How severe is CVE-2019-25037?

CVE-2019-25037 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.13% probability of exploitation in the next 30 days.

How do I fix CVE-2019-25037?

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-2019-25037?

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

Scan your code now

Source: NVD / NIST