TI-2024-28774 Aliases CVE-2024-43099 GHSA-xqww-5c9g-v62q

AutomationDirect DirectLogic H2-DM1E Authentication Bypass by Capture-replay

LOW 39CWE-294Published 2024-09-13 · Updated 2024-09-13

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-294.

Summary

The session hijacking attack targets the application layer's control mechanism, which manages authenticated sessions between a host PC and a PLC. During such sessions, a session key is utilized to maintain security. However, if an attacker captures this session key, they can inject traffic into an ongoing authenticated session. To successfully achieve this, the attacker also needs to spoof both the IP address and MAC address of the originating host which is typical of a session-based attack.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00284 21st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AutomationDirect	DirectLogic H2-DM1E	up to 2.8.0	—	No fix listed	CNA

DirectLogic H2-DM1E VendorAutomationDirect Affected up to 2.8.0 Fixed in — No fix listed CNA

CPE names CISA-ADP · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:automationdirect:h2-dm1e_firmware::::::::	—	—	AutomationDirect

cpe:2.3:o:automationdirect:h2-dm1e_firmware:*:*:*:*:*:*:*:* Versions — — ·AutomationDirect

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2024-43099
2026-10-03 Alias added: GHSA-xqww-5c9g-v62q

References

Other 1

https://www.cisa.gov/news-events/ics-advisories/icsa-24-256-17

TI-2024-14467 A leftover debug code vulnerability exists in the Telnet Diagnostic Interface… CVSS 3.1CRITICAL 9.8
TI-2024-14780 Improper access control in AutomationDirect P3-550E CVSS 3.1CRITICAL 9.1
TI-2025-24868 AutomationDirect MB-Gateway Missing Authentication for Critical Function CVSS 4.0CRITICAL 10.0
TI-2024-16461 Stack-based buffer overflow in AutomationDirect P3-550E CVSS 3.1CRITICAL 9.8
TI-2024-16460 Stack-based buffer overflow in AutomationDirect P3-550E CVSS 3.1CRITICAL 9.8
TI-2021-12594 Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel CVSS 3.1CRITICAL 9.8

See all 66 →

Sources

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