CVE-2025-30192Network attack vector

DNS resolution disruption via weak ECS reply validation

Published Jul 21, 2025 · Updated Jul 21, 2025

Insufficient reply validation in PowerDNS Recursor allows remote attackers to disrupt DNS resolution by spoofing answers to ECS queries. In lwres.cc, the resolver handles answers to ECS-enabled outbound requests without the stricter chaining and reply checks applied by patched releases. Exposure requires nondefault outgoing ECS to be enabled; successful spoofing pollutes cached DNS answers without compromising the host.

CVSS severity7.5
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient reply validation in PowerDNS Recursor allows remote attackers to disrupt DNS resolution by spoofing answers to ECS queries. In lwres.cc, the resolver handles answers to ECS-enabled outbound requests without the stricter chaining and reply checks applied by patched releases. Exposure requires nondefault outgoing ECS to be enabled; successful spoofing pollutes cached DNS answers without compromising the host.

The record

CVE
CVE-2025-30192
Published
Jul 21, 2025
Updated
Jul 21, 2025
Vendor
PowerDNS
Product
PowerDNS Recursor
Classifications
CWE-345, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2025Record 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 versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PowerDNS · PowerDNS RecursorAffected versions are unavailable in this record.

Published CVSS scores

7.5Open-XchangeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1565.001Stored Data Manipulation

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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