MEDIUMPOC
CVE-2018-3639
CWE-203Published: May 22, 2018· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official Description
Systems with microprocessors utilizing speculative execution and speculative execution of memory reads before the addresses of all prior memory writes are known may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis, aka Speculative Store Bypass (SSB), Variant 4.
Technical Analysis
CVE-2018-3639 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.5.
A proof-of-concept (PoC) exploit exists for CVE-2018-3639. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
arm1 product(s)
cortex-a
Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
intel201 product(s)
atom catom eatom x5-e3930atom x5-e3940atom x7-e3950atom zceleron jceleron ncore i3core i5core i7core m+189
Microsoft11 product(s)
surfacesurface booksurface prosurface pro with lte advancedsurface studiowindows 10windows 7windows 8.1windows server 2008windows server 2012windows server 2016
mitel8 product(s)
micloud management portalmicollabmivoic mx-onemivoice 5000mivoice border gatewaymivoice businessmivoice connectopen integration gateway
nvidia2 product(s)
jetson tx1jetson tx2
Oracle2 product(s)
local service management systemsolaris
Red Hat11 product(s)
mrg realtimeopenstackvirtualization managerenterprise linux desktopenterprise linux eusenterprise linux serverenterprise linux server ausenterprise linux server tusenterprise linux workstationvirtualizationenterprise linux
schneider-electric1 product(s)
struxureware data center expert
siemens76 product(s)
itc1500 firmwareitc1500itc1500 pro firmwareitc1500 proitc1900 firmwareitc1900itc1900 pro firmwareitc1900 proitc2200 firmwareitc2200itc2200 pro firmwareitc2200 pro+64
sonicwall6 product(s)
cloud global management systememail securityglobal management systemsecure mobile accessweb application firewallsonicosv
Source: NVD CPE · 665 total CPE entries
Exploit & PoC Resources
POC AVAILABLEProof-of-concept code exists
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
ADVISORYhttp://www.fujitsu.com/global/support/products/software/security/products-f/cve-2018-3639e.html
ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03850en_us
ADVISORYhttps://usn.ubuntu.com/3651-1/
ADVISORYhttps://usn.ubuntu.com/3652-1/
ADVISORYhttps://usn.ubuntu.com/3653-1/
ADVISORYhttps://usn.ubuntu.com/3653-2/
ADVISORYhttps://usn.ubuntu.com/3654-1/
ADVISORYhttps://usn.ubuntu.com/3654-2/
ADVISORYhttps://usn.ubuntu.com/3655-1/
ADVISORYhttps://usn.ubuntu.com/3655-2/
ADVISORYhttps://usn.ubuntu.com/3679-1/
ADVISORYhttps://usn.ubuntu.com/3680-1/
ADVISORYhttps://usn.ubuntu.com/3756-1/
ADVISORYhttps://usn.ubuntu.com/3777-3/
ADVISORYhttps://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-18-0006
ADVISORYhttp://www.fujitsu.com/global/support/products/software/security/products-f/cve-2018-3639e.html
ADVISORYhttps://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03850en_us
ADVISORYhttps://usn.ubuntu.com/3651-1/
ADVISORYhttps://usn.ubuntu.com/3652-1/
ADVISORYhttps://usn.ubuntu.com/3653-1/
ADVISORYhttps://usn.ubuntu.com/3653-2/
ADVISORYhttps://usn.ubuntu.com/3654-1/
ADVISORYhttps://usn.ubuntu.com/3654-2/
ADVISORYhttps://usn.ubuntu.com/3655-1/
ADVISORYhttps://usn.ubuntu.com/3655-2/
ADVISORYhttps://usn.ubuntu.com/3679-1/
ADVISORYhttps://usn.ubuntu.com/3680-1/
ADVISORYhttps://usn.ubuntu.com/3756-1/
ADVISORYhttps://usn.ubuntu.com/3777-3/
All References (294)
→
http://support.lenovo.com/us/en/solutions/LEN-22133Third Party Advisory
→
→
http://www.openwall.com/lists/oss-security/2020/06/10/1Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2020/06/10/2Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2020/06/10/5Mailing List · Third Party Advisory
→
http://www.securityfocus.com/bid/104232Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1040949Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1042004Third Party Advisory · VDB Entry
→
http://xenbits.xen.org/xsa/advisory-263.htmlThird Party Advisory
→
https://access.redhat.com/errata/RHSA-2018:1629Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2018:1630Third Party Advisory
→
https://access.redhat.com/errata/RHSA-2018:1632Third Party Advisory
Quick Facts
CVE IDCVE-2018-3639
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-203
CISA KEVNo
ExploitPOC
Affected12 vendor(s)
PublishedMay 22, 2018
Related CVEs (CWE-203)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2018-3639 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.