CVE-2025-71058Public exploitNetwork attack vector

Unauthenticated DNS cache poisoning via unvalidated responses

Published Apr 7, 2026 · Updated Apr 7, 2026

DNS cache poisoning in Dual DHCP DNS Server 8.01 and earlier allows remote attackers to redirect clients via forged UDP responses. The forwarder reuses the client-supplied TXID, indexes pending requests by that value, and unconditionally caches matching responses without validating their source address or bailiwick. An off-path attacker must inject a forged response before the legitimate upstream reply; success redirects subsequent lookups for the poisoned name to an attacker-selected address.

CVSS severity9.1
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

DNS cache poisoning in Dual DHCP DNS Server 8.01 and earlier allows remote attackers to redirect clients via forged UDP responses. The forwarder reuses the client-supplied TXID, indexes pending requests by that value, and unconditionally caches matching responses without validating their source address or bailiwick. An off-path attacker must inject a forged response before the legitimate upstream reply; success redirects subsequent lookups for the poisoned name to an attacker-selected address.

The record

CVE
CVE-2025-71058
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1FPokerFace Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1557Adversary-in-the-Middle

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo