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TI-2021-16831 Aliases CVE-2021-39575GHSA-ppwx-w5v2-mfj6

An issue was discovered in swftools through 20200710.

Priority LOW 26CWE-476Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-476.

Summary

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

Why it matters now

EPSS 0.00635 50th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:swftools:swftools:*:*:*:*:*:*:*:*up to 2020-07-10VulnerableSwftools
  • cpe:2.3:a:swftools:swftools:*:*:*:*:*:*:*:* Versions up to 2020-07-10 Vulnerable ·Swftools

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-39575
  2. 2026-10-03 Alias added: GHSA-ppwx-w5v2-mfj6
  3. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Exploit 1

  • TI-2022-18945 SWFTools commit 772e55a was discovered to contain a heap-use-after-free via the function grow_unicode at /lib/ttf.c. CVSS 3.1CRITICAL 9.8
  • TI-2022-18944 SWFTools commit 772e55a was discovered to contain a heap-buffer overflow via the function readU8 at /lib/ttf.c. CVSS 3.1CRITICAL 9.8
  • TI-2024-16610 A global-buffer-overflow vulnerability was found in SWFTools v0.9.2, in the function LineText at lib/swf5compiler.flex. CVSS 3.1HIGH 8.8
  • TI-2024-18884 Null Pointer Dereference vulnerability in swfdump in swftools 0.9.2 allows attackers to… CVSS 3.1HIGH 7.5
  • TI-2024-15195 swftools 0.9.2 was discovered to contain a heap-use-after-free vulnerability via the… CVSS 3.1HIGH 7.8
  • TI-2024-15185 swftools 0.9.2 was discovered to contain a heap-use-after-free via the function… CVSS 3.1HIGH 7.8
See all 125 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences