The affected TBox RTUs generate software security tokens using insufficient entropy.

published 2023-07-03 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-40555

cvss: 5.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits: 0; none known

The affected TBox RTUs generate software security tokens using insufficient entropy. The random seed used to generate the software tokens is not initialized correctly, and other parts of the token are generated using predictable time-based values. An attacker with this knowledge could successfully brute force the token and authenticate themselves.

Vendor advisories

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

cisa ICSA-23-180-03 updated 2023-06-29 cvss 5.9

Ovarro TBox RTUs

Ovarro TBox LT2 <= 1.50.598 Ovarro TBox MS-CPU32 <= 1.50.598 Ovarro TBox MS-CPU32-S2 <= 1.50.598 Ovarro TBox RM2 <= 1.50.598 Ovarro TBox TG2 <= 1.50.598
affected: mitigation “Ovarro recommends users update the affected products to the latest version by downloading the newest software version from the Ovarro website in the "Customer Support" section.”

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: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-10-25)

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Ovarro TBox MS-CPU32
Ovarro TBox MS-CPU32-S2
Ovarro TBox LT2
Ovarro TBox TG2
Ovarro TBox RM2

Classification

Weakness

CWE-331 Insufficient Entropy

References

cisa.gov /news-events/ics-advisories/icsa-23-180-03
government-resource, mitigation, third-party-advisory, us-government-resource

Sources

CVE List CVE-2023-36610
NVD CVE-2023-36610

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.

Summary