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Vulnerability record · CVE-2021-33602 · published 6 October 2021

CVE-2021-33602: F-secure atlant vulnerability

F Secure · Atlant

A vulnerability affecting the F-Secure Antivirus engine was discovered when the engine tries to unpack a zip archive (LZW decompression method), and this can crash the scanning engine. The vulnerability can be exploited remotely by an attacker. A successful attack will result in Denial-of-Service of the Anti-Virus engine.

5.3 CVSS 3.1 Medium EPSS 0.60% · top 53.5%
5.3CVSS 3.1 base score, v2 5.0
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A vulnerability affecting the F-Secure Antivirus engine was discovered when the engine tries to unpack a zip archive (LZW decompression method), and this can crash the scanning engine. The vulnerability can be exploited remotely by an attacker. A successful attack will result in Denial-of-Service of the Anti-Virus engine.

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

Affected products

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

References

LinkTags
https://www.f-secure.com/en/business/support-and-downloads/security-advisories Vendor Advisory
https://www.f-secure.com/en/business/support-and-downloads/security-advisories Vendor Advisory

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Related vulnerabilities

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

10.0CVE-2007-2967F-secure anti-virus improper input validation vulnerabilityMultiple F-Secure anti-virus products for Microsoft Windows and Linux before 20070522 allow remote attackers to cause a denial of service (file scann…EPSS 4.8%10.0CVE-2004-0234Clearswift mailsweeper memory buffer overflow vulnerabilityMultiple stack-based buffer overflows in the get_header function in header.c for LHA 1.14, as used in products such as Barracuda Spam Firewall, allow…EPSS 10%9.3CVE-2007-3300F-secure anti-virus vulnerabilityMultiple F-Secure anti-virus products for Microsoft Windows and Linux before 20070619 allow remote attackers to bypass scanning via a crafted header …EPSS 3.7%8.8CVE-2021-33601F-secure internet gatekeeper vulnerabilityA vulnerability was discovered in the web user interface of F-Secure Internet Gatekeeper. An authenticated user can modify settings through the web u…EPSS 0.94%7.8CVE-2023-43766F-secure linux protection improper privilege management vulnerabilityCertain WithSecure products allow Local privilege escalation via the lhz archive unpack handler. This affects WithSecure Client Security 15, WithSecu…EPSS 0.16%7.6CVE-2006-2838F-secure anti-virus vulnerabilityBuffer overflow in the web console in F-Secure Anti-Virus for Microsoft Exchange 6.40, and Internet Gatekeeper 6.40 through 6.42 and 6.50 allows remo…EPSS 5.7%7.5CVE-2023-49322F-secure linux protection vulnerabilityCertain WithSecure products allow a Denial of Service because there is an unpack handler crash that can lead to a scanning engine crash. This affects…EPSS 0.70%7.5CVE-2023-43760F-secure client security vulnerabilityCertain WithSecure products allow Denial of Service via a fuzzed PE32 file. This affects WithSecure Client Security 15, WithSecure Server Security 15…EPSS 0.64%

Source: NIST National Vulnerability Database (record CVE-2021-33602), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.