MEDIUM
CVE-2015-3963
CWE-330Published: August 4, 2015· Updated: Jun 17, 2026
5.8
CVSS v3.1
Official Description
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.
Technical Analysis
CVE-2015-3963 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityM
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityNone
IntegrityP
AvailabilityP
AV:N/AC:M/Au:N/C:N/I:P/A:P
Affected Vendors & Products
schneider-electric13 product(s)
sage 1210sage 1230sage 1250sage 1310sage 1330sage 1350sage 1410sage 1430sage 1450sage 2200sage 2400sage 3030+1
windriver1 product(s)
vxworks
Source: NVD CPE · 18 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (14)
→
http://www.schneider-electric.com/ww/en/download/document/SEVD-2015-162-01Patch · Third Party Advisory
→
http://www.securityfocus.com/bid/75302Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1032730Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1033181Third Party Advisory · VDB Entry
→
https://ics-cert.us-cert.gov/advisories/ICSA-15-169-01Third Party Advisory · US Government Resource
→
https://ics-cert.us-cert.gov/advisories/ICSA-15-169-01AThird Party Advisory · US Government Resource
→
https://security.netapp.com/advisory/ntap-20160324-0001/Third Party Advisory
→
http://www.schneider-electric.com/ww/en/download/document/SEVD-2015-162-01Patch · Third Party Advisory
→
http://www.securityfocus.com/bid/75302Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1032730Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1033181Third Party Advisory · VDB Entry
→
https://ics-cert.us-cert.gov/advisories/ICSA-15-169-01Third Party Advisory · US Government Resource
→
https://ics-cert.us-cert.gov/advisories/ICSA-15-169-01AThird Party Advisory · US Government Resource
→
https://security.netapp.com/advisory/ntap-20160324-0001/Third Party Advisory
Quick Facts
CVE IDCVE-2015-3963
CVSS Score5.8 / 10
SeverityMEDIUM
WeaknessCWE-330
CISA KEVNo
Affected2 vendor(s)
PublishedAug 4, 2015
Related CVEs (CWE-330)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2015-3963 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.