HOMEVULNERABILITIESCVE-2019-25034
CRITICAL

CVE-2019-25034

CWE-190Published: April 27, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading to an out-of-bounds write. 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

NVD Source

Technical Analysis

CVE-2019-25034 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
nlnetlabs1 product(s)
unbound
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/
PATCHhttps://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/05/msg00007.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210507-0007/
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/05/msg00007.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210507-0007/

All References (6)

→
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

Quick Facts

CVE IDCVE-2019-25034
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-190
CISA KEVNo
Affected2 vendor(s)
PublishedApr 27, 2021

Related CVEs (CWE-190)

CVE-2010-1233
10.0
CVE-2026-24814
10.0
CVE-2015-5097
10.0
CVE-2015-5108
10.0
CVE-2010-3254
10.0
CVE-2012-5143
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-25034 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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