How severe is CVE-2023-42525?

CVE-2023-42525 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-42525 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-42525?

CVE-2023-42525 primarily affects Withsecure Client Security. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-42525?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-42525 published?

CVE-2023-42525 was published on 2023-09-18 and last updated on 2026-06-17.

CVE-2023-42525

CVE-2023-42525 is a high-severity vulnerability in Withsecure Client Security with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-835
Affected product: Withsecure Client Security
Published: 2023-09-18
Last modified: 2026-06-17

Description

Certain WithSecure products allow an infinite loop in a scanning engine via unspecified file types. 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.

Frequently asked questions

What is CVE-2023-42525?: Certain WithSecure products allow an infinite loop in a scanning engine via unspecified file types. 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.
How severe is CVE-2023-42525?: CVE-2023-42525 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-42525 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-42525?: CVE-2023-42525 primarily affects Withsecure Client Security. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-42525?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-42525 published?: CVE-2023-42525 was published on 2023-09-18 and last updated on 2026-06-17.

References

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

Affected products (7)

cpe:2.3:a:withsecure:client_security:15:*:*:*:*:*:*:*
cpe:2.3:a:withsecure:elements_endpoint_protection:*:*:*:*:*:*:*:*
cpe:2.3:a:withsecure:email_and_server_security:15:*:*:*:*:*:*:*
cpe:2.3:a:withsecure:server_security:15:*:*:*:*:*:*:*
cpe:2.3:a:withsecure:linux_protection:12.0:*:*:*:*:*:*:*
cpe:2.3:a:withsecure:linux_security_64:12.0:*:*:*:*:*:*:*
cpe:2.3:a:withsecure:atlant:1.0.35-1:*:*:*:*:*:*:*

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