CVE-2023-29485Public exploitNetwork attack vector

Code execution via unfiltered third-party DNS requests

Published Dec 21, 2023 · Updated Sep 25, 2024

DNS-filter bypass in Heimdal Thor agent 3.4.2 and earlier on Windows and 2.6.9 and earlier on macOS allows attackers to evade blocking. DarkLayer Guard intercepts system-generated DNS requests but leaves requests generated by third-party resolvers outside its filtering path. The bypass permits connections to blocked domains, enabling arbitrary code execution and sensitive-data disclosure; Heimdal disputes the issue as outside the product design.

CVSS severity9.8
Critical
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DNS-filter bypass in Heimdal Thor agent 3.4.2 and earlier on Windows and 2.6.9 and earlier on macOS allows attackers to evade blocking. DarkLayer Guard intercepts system-generated DNS requests but leaves requests generated by third-party resolvers outside its filtering path. The bypass permits connections to blocked domains, enabling arbitrary code execution and sensitive-data disclosure; Heimdal disputes the issue as outside the product design.

The record

CVE
CVE-2023-29485
Published
Dec 21, 2023
Updated
Sep 25, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-306
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

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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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function

Public exploit references

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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