Read the docs
TI-2023-13859 Aliases CVE-2023-29487GHSA-9jxf-24g6-463j

An issue was discovered in Heimdal Thor agent versions 3.4.2 and before on Windows and…

Priority MEDIUM 46CWE-1333Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-1333.

Summary

An issue was discovered in Heimdal Thor agent versions 3.4.2 and before on Windows and 2.6.9 and before on macOS, allows attackers to cause a denial of service (DoS) via the Threat To Process Correlation threat prevention module. NOTE: Heimdal asserts this is not a valid vulnerability. Their DNS Security for Endpoint solution includes an optional feature to provide extra information on the originating process that made a DNS request. The lack of process identification in DNS logs is therefore falsely categorized as a DoS issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00658 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:heimdalsecurity:thor:*:*:*:*:*:*:*:*up to 3.5.3VulnerableHeimdalsecurity
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*not specified by NVDRunning onMicrosoft
cpe:2.3:a:heimdalsecurity:thor:*:*:*:*:*:*:*:*up to 2.6.9VulnerableHeimdalsecurity
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*not specified by NVDRunning onApple
  • cpe:2.3:a:heimdalsecurity:thor:*:*:*:*:*:*:*:* Versions up to 3.5.3 Vulnerable ·Heimdalsecurity
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
  • cpe:2.3:a:heimdalsecurity:thor:*:*:*:*:*:*:*:* Versions up to 2.6.9 Vulnerable ·Heimdalsecurity
  • cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-29487
  2. 2026-10-03 Alias added: GHSA-9jxf-24g6-463j
  3. 2026-10-11 EPSS moved to the 50th–90th percentile

References

Exploit 1

  • TI-2023-13858 An issue was discovered in Heimdal Thor agent versions 3.4.2 and before 3.7.0 on Windows… CVSS 3.1CRITICAL 9.8
  • TI-2023-13857 An issue was discovered in Heimdal Thor agent versions 3.4.2 and before on Windows and… CVSS 3.1CRITICAL 9.8
  • TI-2019-05994 Heimdal Thor Agent 2.5.17x before 2.5.173 does not verify X.509 certificates from TLS… CVSS 3.0CRITICAL 9.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences