CVE-2015-3963

Vxworks vulnerability

CVSS

5.8

EPSS

3.7%

EPSS pct

89th

Exploited

No known

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.

Affected vendor

Windriver

Affected product

Vxworks

CVSS vector

AV:N/AC:M/Au:N/C:N/I:P/A:P

Weakness type (CWE)

CWE-330 — Use of Insufficiently Random Values

Published

2015-08-04

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to partial impact to integrity, partial impact to availability.

Its EPSS score of 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2015-3963

Confirm whether Windriver Vxworks is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2015-3963.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2015-3963

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2015-3963 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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