CVE-2021-33603
CVE-2021-33603 is a medium-severity vulnerability in F-secure Atlant with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (42nd percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: F-secure Atlant
- Published:
- Last modified:
Description
A Denial-of-Service (DoS) vulnerability was discovered in F-Secure Atlant whereby the AVPACK module component used in certain F-Secure products can crash while scanning a fuzzed files. The exploit can be triggered remotely by an attacker. A successful attack will result in Denial-of-Service (DoS) of the Anti-Virus engine.
Frequently asked questions
- What is CVE-2021-33603?
- A Denial-of-Service (DoS) vulnerability was discovered in F-Secure Atlant whereby the AVPACK module component used in certain F-Secure products can crash while scanning a fuzzed files. The exploit can be triggered remotely by an attacker. A successful attack will result in Denial-of-Service (DoS) of the Anti-Virus engine.
- How severe is CVE-2021-33603?
- CVE-2021-33603 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
- Is CVE-2021-33603 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-33603?
- CVE-2021-33603 primarily affects F-secure Atlant. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-33603?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-33603 published?
- CVE-2021-33603 was published on 2021-10-08 and last updated on 2026-06-17.
References
- https://www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-fame
- https://www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33603
Affected products (7)
- cpe:2.3:a:f-secure:atlant:-:*:*:*:*:*:*:*
- cpe:2.3:a:f-secure:cloud_protection_for_salesforce:-:*:*:*:*:*:*:*
- cpe:2.3:a:f-secure:elements_for_microsoft_365:-:*:*:*:*:*:*:*
- cpe:2.3:a:f-secure:internet_gatekeeper:-:*:*:*:*:-:*:*
- cpe:2.3:a:f-secure:linux_security:-:*:*:*:*:*:*:*
- cpe:2.3:a:f-secure:elements_endpoint_detection_and_response:-:*:*:*:*:*:*:*
- cpe:2.3:a:f-secure:elements_endpoint_protection:-:*:*:*:*:*:*:*
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