MEDIUM
CVE-2019-6493
CWE-401Published: April 11, 2019· Updated: Jun 17, 2026
5.5
CVSS v3.1
Official Description
SmartDefragDriver.sys (2.0) in IObit Smart Defrag 6 never frees an executable kernel pool that is allocated with user defined bytes and size when IOCTL 0x9C401CC0 is called. This kernel pointer can be leaked if the kernel pool becomes a "big" pool.
Technical Analysis
CVE-2019-6493 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.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Vendors & Products
iobit1 product(s)
smart defrag
Source: NVD CPE · 1 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 (4)
→
https://downwithup.github.io/CVEPosts.htmlExploit · Vendor Advisory
→
https://www.iobit.com/en/iobitsmartdefrag.phpProduct · Vendor Advisory
→
https://downwithup.github.io/CVEPosts.htmlExploit · Vendor Advisory
→
https://www.iobit.com/en/iobitsmartdefrag.phpProduct · Vendor Advisory
Quick Facts
CVE IDCVE-2019-6493
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-401
CISA KEVNo
Affected1 vendor(s)
PublishedApr 11, 2019
Related CVEs (CWE-401)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-6493 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.