CVE-2021-39553

Public Exploit

Description

An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function grealloc() located in gmem.cc. It allows an attacker to cause Denial of Service.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.19%
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/matthiaskramm/swftools/issues/103 issue tracking exploit technical description

Frequently Asked Questions

What is the severity of CVE-2021-39553?
CVE-2021-39553 has been scored as a medium severity vulnerability.
How to fix CVE-2021-39553?
To fix CVE-2021-39553, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-39553 being actively exploited in the wild?
It is possible that CVE-2021-39553 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.