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Vulnerability record · CVE-2023-42521 · published 18 September 2023

CVE-2023-42521: Withsecure client security uncontrolled resource consumption vulnerability

Withsecure · Client Security

Certain WithSecure products allow a remote crash of a scanning engine via processing of a compressed file. 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.

7.5 CVSS 3.1 High EPSS 0.62% · top 52.6% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Certain WithSecure products allow a remote crash of a scanning engine via processing of a compressed file. 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.

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

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.withsecure.com/en/support/security-advisories Vendor Advisory
https://www.withsecure.com/en/support/security-advisories Vendor Advisory

Track CVE-2023-42521 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2024-4454Withsecure client security link following vulnerabilityWithSecure Elements Endpoint Protection Link Following Local Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalat…EPSS 0.40%7.8CVE-2023-47172Withsecure client security vulnerabilityCertain WithSecure products allow Local Privilege Escalation. This affects WithSecure Client Security 15, WithSecure Server Security 15, WithSecure E…EPSS 0.22%7.5CVE-2023-47263Withsecure client security vulnerabilityCertain WithSecure products allow a Denial of Service (DoS) in the antivirus engine when scanning a fuzzed PE32 file. This affects WithSecure Client …EPSS 0.70%7.5CVE-2023-47264Withsecure client security out-of-bounds read vulnerabilityCertain WithSecure products have a buffer over-read whereby processing certain fuzz file types may cause a denial of service (DoS). This affects With…EPSS 0.70%7.5CVE-2023-42524Withsecure client security vulnerabilityCertain WithSecure products allow an infinite loop in a scanning engine via unspecified file types. This affects WithSecure Client Security 15, WithS…EPSS 0.62%7.5CVE-2023-42525Withsecure client security vulnerabilityCertain WithSecure products allow an infinite loop in a scanning engine via unspecified file types. This affects WithSecure Client Security 15, WithS…EPSS 0.62%7.5CVE-2023-42522Withsecure client security uncontrolled resource consumption vulnerabilityCertain WithSecure products allow a remote crash of a scanning engine via processing of an import struct in a PE file. This affects WithSecure Client…EPSS 0.62%7.5CVE-2023-42523Withsecure client security uncontrolled resource consumption vulnerabilityCertain WithSecure products allow a remote crash of a scanning engine via unpacking of a PE file. This affects WithSecure Client Security 15, WithSec…EPSS 0.62%

Source: NIST National Vulnerability Database (record CVE-2023-42521), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.