HOMEVULNERABILITIESCVE-2023-43766
HIGH

CVE-2023-43766

NVD-CWE-noinfoPublished: September 22, 2023· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

Certain WithSecure products allow Local privilege escalation via the lhz archive unpack handler. This affects WithSecure Client Security 15, WithSecure Server Security 15, WithSecure Email and Server Security 15, WithSecure Elements Endpoint Protection 17 and later, WithSecure Client Security for Mac 15, WithSecure Elements Endpoint Protection for Mac 17 and later, Linux Security 64 12.0 , Linux Protection 12.0, and WithSecure Atlant (formerly F-Secure Atlant) 1.0.35-1.

NVD Source

Technical Analysis

CVE-2023-43766 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), 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.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Apple1 product(s)
macos
f-secure7 product(s)
linux protectionlinux security 64atlantclient securityelements endpoint protectionemail and server securityserver security
Linux1 product(s)
linux kernel
Microsoft1 product(s)
windows
Source: NVD CPE · 10 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://www.withsecure.com/en/support/security-advisories
ADVISORYhttps://www.withsecure.com/en/support/security-advisories

All References (4)

→
https://www.withsecure.com/en/support/security-advisoriesVendor Advisory
→
https://www.withsecure.com/en/support/security-advisories/cve-2023-nnn4Broken Link
→
https://www.withsecure.com/en/support/security-advisoriesVendor Advisory
→
https://www.withsecure.com/en/support/security-advisories/cve-2023-nnn4Broken Link

Quick Facts

CVE IDCVE-2023-43766
CVSS Score7.8 / 10
SeverityHIGH
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected4 vendor(s)
PublishedSep 22, 2023

Related CVEs (NVD-CWE-noinfo)

CVE-2026-46798
10.0
CVE-2009-2543
10.0
CVE-2005-2222
10.0
CVE-2013-2422
10.0
CVE-2009-2452
10.0
CVE-2005-2700
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-43766 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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