CVE-2019-25037

Process crash via invalid packet assertion

Published Apr 27, 2021 · Updated Nov 19, 2024

A reported reachable assertion in dname_pkt_copy in NLnet Labs Unbound before 1.9.5 crashes code that processes an invalid packet. The audit found that malformed packet data reaches assert() inside the domain-name copy routine, terminating execution when the invariant check fails. NLnet Labs disputes the vulnerability because a running installation cannot reach this condition from either remote or local input, leaving no demonstrated service impact.

CVSS severity7.5
High
EPSS probability2.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A reported reachable assertion in dname_pkt_copy in NLnet Labs Unbound before 1.9.5 crashes code that processes an invalid packet. The audit found that malformed packet data reaches assert() inside the domain-name copy routine, terminating execution when the invariant check fails. NLnet Labs disputes the vulnerability because a running installation cannot reach this condition from either remote or local input, leaving no demonstrated service impact.

The record

CVE
CVE-2019-25037
Published
Apr 27, 2021
Updated
Nov 19, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 19, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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