Medium severity6.5NVD Advisory· Published Jun 30, 2017· Updated Jun 17, 2026
CVE-2017-6030
CVE-2017-6030
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.
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Affected products
6cpe:2.3:o:schneider-electric:modicon_m221_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:schneider-electric:modicon_m221_firmware:*:*:*:*:*:*:*:*range: <=1.1.1.5
- (no CPE)range: <1.5.0.0
cpe:2.3:o:schneider-electric:modicon_m241_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:schneider-electric:modicon_m241_firmware:*:*:*:*:*:*:*:*range: <=4.0.3.20
- (no CPE)range: <4.0.5.11
cpe:2.3:o:schneider-electric:modicon_m251_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:schneider-electric:modicon_m251_firmware:*:*:*:*:*:*:*:*range: <=4.0.3.20
- (no CPE)range: <4.0.5.11
Patches
Vulnerability mechanics
References
3- www.securityfocus.com/bid/97254nvdThird Party AdvisoryVDB Entry
- ics-cert.us-cert.gov/advisories/ICSA-17-089-02nvdThird Party AdvisoryUS Government Resource
- github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2017/icsa-17-089-02.jsonnvd
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