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.
Published 2017-06-30 03:29:00
Updated 2022-02-03 13:45:51
Source ICS-CERT
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2017-6030

0.09%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 35 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2017-6030

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.4
MEDIUM AV:N/AC:L/Au:N/C:N/I:P/A:P
10.0
4.9
NIST
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
3.9
2.5
NIST

CWE ids for CVE-2017-6030

  • The product uses an algorithm or scheme that produces insufficient entropy, leaving patterns or clusters of values that are more likely to occur than others.
    Assigned by: nvd@nist.gov (Primary)
  • The product's random number generator produces a series of values which, when observed, can be used to infer a relatively small range of possibilities for the next value that could be generated.
    Assigned by: ics-cert@hq.dhs.gov (Secondary)

References for CVE-2017-6030

Products affected by CVE-2017-6030

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