Certain WithSecure products allow Local privilege escalation via the lhz archive unpack…
Priority LOW 35CWE-269Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Privilege escalation
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-269.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00161 5th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:f-secure:linux_protection:12.0:*:*:*:*:*:*:* | 12.0 | Vulnerable | F-Secure |
| cpe:2.3:a:f-secure:linux_security_64:12.0:*:*:*:*:*:*:* | 12.0 | Vulnerable | F-Secure |
| cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Linux |
| cpe:2.3:a:f-secure:atlant:1.0.35-1:*:*:*:*:*:*:* | 1.0.35-1 | Vulnerable | F-Secure |
| cpe:2.3:a:f-secure:client_security:15.00:*:*:*:*:*:*:* | 15.00 | Vulnerable | F-Secure |
| cpe:2.3:a:f-secure:elements_endpoint_protection:*:*:*:*:*:*:*:* | 17.0 | Vulnerable | F-Secure |
| cpe:2.3:a:f-secure:email_and_server_security:15.00:*:*:*:*:*:*:* | 15.00 | Vulnerable | F-Secure |
| cpe:2.3:a:f-secure:server_security:15.00:*:*:*:*:*:*:* | 15.00 | Vulnerable | F-Secure |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Apple |
- cpe:2.3:a:f-secure:linux_protection:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·F-Secure
- cpe:2.3:a:f-secure:linux_security_64:12.0:*:*:*:*:*:*:* Versions 12.0 Vulnerable ·F-Secure
- cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Linux
- cpe:2.3:a:f-secure:atlant:1.0.35-1:*:*:*:*:*:*:* Versions 1.0.35-1 Vulnerable ·F-Secure
- cpe:2.3:a:f-secure:client_security:15.00:*:*:*:*:*:*:* Versions 15.00 Vulnerable ·F-Secure
- cpe:2.3:a:f-secure:elements_endpoint_protection:*:*:*:*:*:*:*:* Versions 17.0 Vulnerable ·F-Secure
- cpe:2.3:a:f-secure:email_and_server_security:15.00:*:*:*:*:*:*:* Versions 15.00 Vulnerable ·F-Secure
- cpe:2.3:a:f-secure:server_security:15.00:*:*:*:*:*:*:* Versions 15.00 Vulnerable ·F-Secure
- cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Apple
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-43766
- 2026-10-03 Alias added: GHSA-qq37-j4m8-2hhr
References
More F-Secure Atlant vulnerabilities
- TI-2023-23465 Certain WithSecure products allow Denial of Service via the aepack archive unpack handler. CVSS 3.1HIGH 7.5
- TI-2023-23463 Certain WithSecure products allow Denial of Service in the aeelf component. CVSS 3.1HIGH 7.5
- TI-2023-23460 Certain WithSecure products allow Denial of Service (infinite loop). CVSS 3.1HIGH 7.5
- TI-2023-26941 Certain WithSecure products allow a Denial of Service because there is an unpack handler… CVSS 3.1HIGH 7.5
- TI-2023-23459 Certain WithSecure products allow Denial of Service via a fuzzed PE32 file. CVSS 3.1HIGH 7.5
- TI-2022-11504 Denial-of-service (DoS) in F-Secure All F-Secure and WithSecure Endpoint Protection… CVSS 3.1HIGH 7.5
Sources
- CVE-2023-43766 · CVE Program
- CVE-2023-43766 · NVD
- FIRST EPSS
- GHSA-qq37-j4m8-2hhr · GitHub Advisory Database · CC BY 4.0
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