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CVE-2015-3963

17
FAUCET Score

CVE-2015-3963 describes a vulnerability in Wind River VxWorks, affecting versions 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, including Schneider Electric SAGE RTU devices. The flaw lies in the improper generation of TCP initial sequence numbers (ISNs), making it easier for remote attackers to spoof TCP sessions. With a CVSS score of 5.8, this vulnerability has a medium severity, allowing for partial integrity and availability impact with medium attack complexity over the network. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.5, <= 6.6CPE matchmatch criteria
cpe:2.3:o:windriver:vxworks:*:*:*:*:*:*:*:*
>= 6.7, < 6.7.1.1CPE matchmatch criteria
cpe:2.3:o:windriver:vxworks:*:*:*:*:*:*:*:*
>= 6.8, < 6.8.3CPE matchmatch criteria
cpe:2.3:o:windriver:vxworks:*:*:*:*:*:*:*:*
>= 6.9, < 6.9.4.4CPE matchmatch criteria
cpe:2.3:o:windriver:vxworks:*:*:*:*:*:*:*:*
6.6.3CPE matchmatch criteria
cpe:2.3:o:windriver:vxworks:6.6.3:*:*:*:cert:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.8MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
4.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.74%
Probability of exploitation in next 30 days
EPSS Percentile
88.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0374 is in the 84th percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

ics-cert.us-cert.gov / advisories/ICSA-15-169-01
Third Party AdvisoryUS Government Resource
ics-cert.us-cert.gov / advisories/ICSA-15-169-01A
Third Party AdvisoryUS Government Resource
security.netapp.com / advisory/ntap-20160324-0001
Third Party Advisory
schneider-electric.com / ww/en/download/document/SEVD-2015-162-01
PatchThird Party Advisory
securityfocus.com / bid/75302
Third Party AdvisoryVDB Entry
securitytracker.com / id/1032730
Third Party AdvisoryVDB Entry
securitytracker.com / id/1033181
Third Party AdvisoryVDB Entry