CVE-2023-43765 [High] | Denial of Service in Linux Protection

Certain WithSecure products allow Denial of Service in the aeelf component. 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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-21	0.40%	0.24%	-0.16%
2	2025-11-18	0.24%	0.40%	+0.16%
3	2025-04-15	—	0.24%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-21

0.40%

0.24%

-0.16%

2025-11-18

0.24%

0.40%

+0.16%

2025-04-15

—

0.24%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

[email protected]

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

3.6

134c704f-9b21-4f2e-91b3-4a467353bcc0

Affected software / configurations for CVE-2023-43765

Vendor	Product	Version	Raw CPE
f-secure	linux_protection	12.0	cpe:2.3:a:f-secure:linux_protection:12.0:::::::*
f-secure	linux_security_64	12.0	cpe:2.3:a:f-secure:linux_security_64:12.0:::::::*
f-secure	atlant	1.0.35-1	cpe:2.3:a:f-secure:atlant:1.0.35-1:::::::*
f-secure	client_security	15.00	cpe:2.3:a:f-secure:client_security:15.00:::::::*
f-secure	elements_endpoint_protection	>= 17.0	cpe:2.3:a:f-secure:elements_endpoint_protection::::::::
f-secure	email_and_server_security	15.00	cpe:2.3:a:f-secure:email_and_server_security:15.00:::::::*
f-secure	server_security	15.00	cpe:2.3:a:f-secure:server_security:15.00:::::::*

References for CVE-2023-43765

URL	Tags
https://www.withsecure.com/en/support/security-advisories	Vendor Advisory
https://www.withsecure.com/en/support/security-advisories/cve-2023-nnn2	Broken Link

URL

CVE-2023-43765

Exploit prediction scoring system (EPSS) score for CVE-2023-43765

Common vulnerability scoring system (CVSS) metrics for CVE-2023-43765

Weakness enumeration for CVE-2023-43765

Affected software / configurations for CVE-2023-43765

References for CVE-2023-43765