What’s Vulnerable › Vulnerabilities

CVE-2021-39593

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% 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 swf_FontExtract_DefineFontInfo() located in swftext.c. It allows an attacker to cause Denial of Service.

Affected products

• swftools: through 2020-07-10

References

• https://github.com/matthiaskramm/swftools/issues/139
• https://github.com/matthiaskramm/swftools/issues/139

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