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Fencer Vulns
critical 9.8

CVE-2024-21785 json

A leftover debug code vulnerability exists in the Telnet Diagnostic Interface functionality of AutomationDirect P3-550E 1.2.10.9.

published 2024-05-28 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-19399

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

A leftover debug code vulnerability exists in the Telnet Diagnostic Interface functionality of AutomationDirect P3-550E 1.2.10.9. A specially crafted series of network requests can lead to unauthorized access. An attacker can send a sequence of requests to trigger this vulnerability.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-24-144-01 updated cvss 9.8

AutomationDirect Productivity PLCs

  • AutomationDirect Productivity 1000 P1-540 CPU FW_1.2.10.10, SW_4.1.1.10 AutomationDirect Productivity 1000 P1-550 CPU FW_1.2.10.10, SW_4.1.1.10 AutomationDirect Productivity 2000 P2-550 CPU FW_1.2.10.10, SW_4.1.1.10 AutomationDirect Productivity 3000 P3-530 CPU FW_1.2.10.9, SW_4.1.1.10 AutomationDirect Productivity 3000 P3-550 CPU FW_1.2.10.9, SW_4.1.1.10 AutomationDirect Productivity 3000 P3-550E CPU FW_1.2.10.9, SW_4.1.1.10
    affected: mitigation “AutomationDirect recommends that users:” automationdirect.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

1.51% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2024-1942 referenced PoC, tagged "exploit" by a source, unverified
  • talosintelligence.com https://www.talosintelligence.com/vulnerability_reports/TALOS-2024-1942 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • AutomationDirect P3-550E

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.