CVE-2021-42200

Name: CVE-2021-42200
Creator: NVD / NIST
Published: 2022-06-02T14:15:29.943+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2021-42200 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An issue was discovered in swftools through 20201222. A NULL pointer dereference exists in the function main() located in swfdump.c. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

An issue was discovered in swftools through 20201222. A NULL pointer dereference exists in the function main() located in swfdump.c. It allows an attacker to cause Denial of Service.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.66%

47.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Swftools	Swftools	<= 2020-12-22

References

https://github.com/matthiaskramm/swftools/issues/170Exploit, Third Party Advisory
https://github.com/matthiaskramm/swftools/issues/170Exploit, Third Party Advisory

Timeline

Published: Jun 2, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42200?

An issue was discovered in swftools through 20201222. A NULL pointer dereference exists in the function main() located in swfdump.c. It allows an attacker to cause Denial of Service.

How severe is CVE-2021-42200?

CVE-2021-42200 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42200?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42200?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST