VULNERABILITY INTELLIGENCE
CVE-2017-6030
CVSS score6.5 MEDIUM
EPSS probability2.14%
CISA KEVNot currently listed
Published2017-06-30
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Description
A predictable value range from previous values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The affected products generate insufficiently random TCP initial sequence numbers that may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections.
Weakness classification
- CWE-331: Insufficient Entropy
- CWE-343: Predictable Value Range from Previous Values
Primary references
- ics-cert@hq.dhs.gov — Third Party Advisory, VDB Entry
- ics-cert@hq.dhs.gov
- ics-cert@hq.dhs.gov — Third Party Advisory, US Government Resource
- af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
- af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, US Government Resource