What’s Vulnerable › Vulnerabilities

CVE-2021-39562

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-09-20 · updated 2026-06-17
• Weakness: CWE-476

Description

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

Affected products

• swftools: through 2020-07-10

References

• https://github.com/matthiaskramm/swftools/issues/98
• https://github.com/matthiaskramm/swftools/issues/98

Get alerted when CVE-2021-39562 or the next vulnerability affects your stack