CVE-2015-3963

mediumpriority · track · 24OT risk · elevatedEPSS 0.037 · 90 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

3.74% (90th) EPSS

CVSS 5.8 · medium

Is it mine?

61 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cisa_csaf_ot

EPSS · scored 2026-10-27

Wind River VxWorks before 5.5.1, 6.5.x through 6.7.x before 6.7.1.1, 6.8.x before 6.8.3, 6.9.x before 6.9.4.4, and 7.x before 7 ipnet_coreip 1.2.2.0, as used on Schneider Electric SAGE RTU devices before J2 and other devices, does not properly generate TCP initial sequence number (ISN) values, which makes it easier for remote attackers to spoof TCP sessions by predicting an ISN value.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

MitigationSchneider Electric SAGE 1210 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1230 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1250 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1310 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1330 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1350 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1410 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1430 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 1450 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 2200 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 2300 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 2400 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 3030 Magnum RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE 3030 RTUcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationSchneider Electric SAGE LANDAC2 Upgrade Kitcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationWind River VxWorkscisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationWind River VxWorks 653 Platform/Platform for Safety Critical ARINC 653cisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released
MitigationWind River VxWorks Certcisa_csaf_ot
A new version of VxWorks, Version 6.9 has been released

cvss

Technical severity, 0–10. One row per scoring source.

5.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05.8mediumAV:N/AC:M/Au:N/C:N/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 4.9

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:N/A:Psecondary · CISA US

v2.04.9mediumAV:N/AC:M/Au:N/C:N/I:P/A:P/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-330USprimaryCWE-343US

affected products (61)

Products and version ranges known to be affected.

showing 20 of 61

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-15-169-01BWind River VXWorks TCP Predictability Vulnerability in ICS Devices (Update B)2015-03-21icsa · cisa_csaf_otUS
This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot NVD CVE.org MITRE

published 2015-08-04modified 2026-06-17

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references (21)

External citations — patches, advisories, analysis.

scry

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