High severity · published Apr 4, 2026
CVE-2016-20059
IObit Malware Fighter 4.3.1 Unquoted Service Path Privilege Escalation
7.8
CVSS
0.2%
EPSS
No
On KEV
Description
IObit Malware Fighter 4.3.1 contains an unquoted service path vulnerability in the IMFservice and LiveUpdateSvc services that allows local attackers to escalate privileges. Attackers can insert a malicious executable file in the unquoted service path and trigger privilege escalation when the service restarts or the system reboots, executing code with LocalSystem privileges.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IM
IObit Malware Fighter · Iobit
4.3.1 · source: vendor
MF
Malware Fighter · Iobit
through 4.3.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-20059
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-20059
Product
http://www.iobit.com/downloadcenter.php?product=malware-fighter-free
Product
http://www.iobit.com/en/index.php
Exploit
https://www.exploit-db.com/exploits/40525
Third Party Advisory
https://www.vulncheck.com/advisories/iobit-malware-fighter-unquoted-service-path-privilege-escalation