HOMEVULNERABILITIESCVE-2019-17093
HIGH

CVE-2019-17093

CWE-427Published: October 23, 2019· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

An issue was discovered in Avast antivirus before 19.8 and AVG antivirus before 19.8. A DLL Preloading vulnerability allows an attacker to implant %WINDIR%\system32\wbemcomn.dll, which is loaded into a protected-light process (PPL) and might bypass some of the self-defense mechanisms. This affects all components that use WMI, e.g., AVGSvc.exe 19.6.4546.0 and TuneupSmartScan.dll 19.1.884.0.

NVD Source

Technical Analysis

CVE-2019-17093 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

avast1 product(s)
antivirus
avg1 product(s)
anti-virus
Source: NVD CPE · 2 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

ADVISORYhttps://safebreach.com/Post/Avast-Antivirus-AVG-Antivirus-DLL-Preloading-into-PPL-and-Potential-Abuses
ADVISORYhttps://safebreach.com/blog
ADVISORYhttps://safebreach.com/Post/Avast-Antivirus-AVG-Antivirus-DLL-Preloading-into-PPL-and-Potential-Abuses
ADVISORYhttps://safebreach.com/blog

All References (4)

→
https://safebreach.com/Post/Avast-Antivirus-AVG-Antivirus-DLL-Preloading-into-PPL-and-Potential-AbusesExploit · Technical Description · Third Party Advisory
→
https://safebreach.com/blogThird Party Advisory
→
https://safebreach.com/Post/Avast-Antivirus-AVG-Antivirus-DLL-Preloading-into-PPL-and-Potential-AbusesExploit · Technical Description · Third Party Advisory
→
https://safebreach.com/blogThird Party Advisory

Quick Facts

CVE IDCVE-2019-17093
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-427
CISA KEVNo
Affected2 vendor(s)
PublishedOct 23, 2019

Related CVEs (CWE-427)

CVE-2025-4981
9.9
CVE-2019-20780
9.8
CVE-2017-3092
9.8
CVE-2017-6517
9.8
CVE-2017-3090
9.8
CVE-2017-3097
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-17093 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.
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