CVE-2024-25638Network attack vector

DNSSEC bypass via unnormalized answer records

Published Jul 22, 2024 · Updated Jul 24, 2025

Improper DNS reply validation in dnsjava before 3.6.0 allows remote attackers to substitute trusted records via rogue recursive resolvers. LookupSession and ValidatingResolver expose unnormalized answer records without verifying their relationship to the queried name or its alias chain. Exploitation requires control of a recursive resolver or a position on UDP or TCP traffic and can redirect credentials, disclose mail, or alter application trust decisions.

CVSS severity8.9
High
EPSS probability0.39%
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

Improper DNS reply validation in dnsjava before 3.6.0 allows remote attackers to substitute trusted records via rogue recursive resolvers. LookupSession and ValidatingResolver expose unnormalized answer records without verifying their relationship to the queried name or its alias chain. Exploitation requires control of a recursive resolver or a position on UDP or TCP traffic and can redirect credentials, disclose mail, or alter application trust decisions.

The record

CVE
CVE-2024-25638
Published
Jul 22, 2024
Updated
Jul 24, 2025
Vendor
dnsjava
Product
dnsjava
Classifications
CWE-345, CWE-349, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 2025Record 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.6.0
  2. Affected versionversion=< 3.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

dnsjava · dnsjavaversion=0 <3.6.0; version=< 3.6.0

Published CVSS scores

8.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-349Acceptance of Extraneous Untrusted Data With Trusted Data
T1557Adversary-in-the-Middle

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

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