CVE-2017-6030

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 prod...

medium 6.5 CVSS 3.1
Published: Jun 30, 2017
Modified: May 29, 2026
Vendor: Schneider-Electric
Product: Modicon M241 Firmware

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.

References

Related CVEs

CVE-2022-0715 critical · 9.1
A CWE-287: Improper Authentication vulnerability exists that could cause an attacker to arbitrarily change the behavior of the UPS when a key is leaked and used to upload malicious
CVE-2021-22787 high · 7.5
A CWE-20: Improper Input Validation vulnerability exists that could cause denial of service of the device when an attacker sends a specially crafted HTTP request to the web server
CVE-2021-22788 high · 7.5
A CWE-787: Out-of-bounds Write vulnerability exists that could cause denial of service when an attacker sends a specially crafted HTTP request to the web server of the device. Affe
CVE-2021-22785 high · 7.5
A CWE-200: Information Exposure vulnerability exists that could cause sensitive information of files located in the web root directory to leak when an attacker sends a HTTP request
CVE-2020-7534 high · 8.8
A CWE-352: Cross-Site Request Forgery (CSRF) vulnerability exists on the web server used, that could cause a leak of sensitive data or unauthorized actions on the web server during
CVE-2021-22789 medium · 6.5
A CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability that could cause a Denial of Service on the Modicon PLC controller / simulator when