CVE-2021-39594
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in...
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function updateusage() located in swftext.c. It allows an attacker to cause Denial of Service.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function updateusage() located in swftext.c. It allows an attacker to cause Denial of Service.
- Record
CVE-2021-39594- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:N/A:P - Weakness
- CWE-476
- Updated
- 2026-11-02
CVE ListNo score
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function updateusage() located in swftext.c. It allows an attacker to cause Denial of Service.
- Record
CVE-2021-39594- Updated
- 2026-11-02
EUVDEUVD-2021-25951No score
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function updateusage() located in swftext.c. It allows an attacker to cause Denial of Service.
- Record
EUVD-2021-25951- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v8h3-c8g3-cjh3No score
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in...
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function updateusage() located in swftext.c. It allows an attacker to cause Denial of Service.
- Record
GHSA-v8h3-c8g3-cjh3- Weakness
- CWE-476
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-39594
Other An issue was discovered in swftools through 20200710. A NULL pointer dereference exists in the function updateusage() located in swftext.c. It allows an attacker to cause Denial of Service.
- Record
UBUNTU-CVE-2021-39594- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-39594 is a medium vulnerability (CVSS 5.5) in Swftools, published September 20, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.66%, the 52nd percentile. No source names a fixed version.