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CVE-2019-25038

30
FAUCET Score

CVE-2019-25038 is an integer overflow vulnerability in the dnscrypt.c component of Unbound before version 1.9.5, affecting Debian and NLnet Labs Unbound installations. This critical vulnerability (CVSS 9.8) has a network attack vector, low attack complexity, and could lead to high impacts on confidentiality, integrity, and availability. Despite its severity, the vendor disputes its exploitability in a running Unbound instance, and there is currently no evidence of active exploitation, public exploit code, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.9.5CPE matchmatch criteria
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.04%
Probability of exploitation in next 30 days
EPSS Percentile
79.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0204 is in the 68th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: unbound-0:1.7.3-15.el8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: unbound-0:1.7.3-12.el8_2
View patch

Vendor Advisories (1)

redhatCVE-2019-25038Moderate

unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c

Dec 11, 2019

References

lists.debian.org / debian-lts-announce/2021/05/msg00007.html
Mailing ListThird Party Advisory
ostif.org / our-audit-of-unbound-dns-by-x41-d-sec-full-results
PatchThird Party Advisory
security.netapp.com / advisory/ntap-20210507-0007
Third Party Advisory