CVE-2026-8398

Analyzed
Published: 15 May 2026, 07:30
Last modified:28 May 2026, 03:55

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (nvd)
EPSS Score
1.46% LOW
1% probability 0.00%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

15 May 2026, 07:30
Published
Vulnerability first disclosed
27 May 2026, 00:00
Added to CISA KEV
Daemon Tools Lite Embedded Malicious Code Vulnerability
28 May 2026, 03:55
Last Modified
Vulnerability information updated
30 May 2026, 00:00
CISA Remediation Due
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

A supply chain attack compromised the official installation packages of DAEMON Tools Lite (Windows versions 12.5.0.2421 through 12.5.0.2434), distributed from the legitimate website daemon-tools.cc between approximately April 8, 2026, and May 5, 2026. Attackers gained unauthorized access to the vendor's (AVB Disc Soft) build or distribution infrastructure and trojanized three binaries: DTHelper.exe, DiscSoftBusServiceLite.exe, and DTShellHlp.exe. These files were digitally signed with the legitimate AVB Disc Soft code-signing certificate, allowing the malicious installers to appear trustworthy and bypass signature-based detection.

CVSS Metrics

  • v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  • v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 1.46%• Percentile: 70%

Techniques & Countermeasures

  • CWE-506•Embedded Malicious Code

    The product contains code that appears to be malicious in nature.

Affected Systems

  • avb disc soft•daemon tools lite

    ≥ 12.5.0.2421, < 2.6.0.*

  • disc-soft•daemon_tools

    12.5.1

References (3)