CVE-2021-39542
An issue was discovered in pdftools through 20200714. A NULL pointer dereference exists in the...
An issue was discovered in pdftools through 20200714. A NULL pointer dereference exists in the function Font::Size() located in font.cpp. 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
An issue was discovered in pdftools through 20200714. A NULL pointer dereference exists in the function Font::Size() located in font.cpp. It allows an attacker to cause Denial of Service.
- Record
CVE-2021-39542- 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 List No score
An issue was discovered in pdftools through 20200714. A NULL pointer dereference exists in the function Font::Size() located in font.cpp. It allows an attacker to cause Denial of Service.
- Record
CVE-2021-39542- Updated
- 2026-11-02
EUVDEUVD-2021-25899 No score
An issue was discovered in pdftools through 20200714. A NULL pointer dereference exists in the function Font::Size() located in font.cpp. It allows an attacker to cause Denial of Service.
- Record
EUVD-2021-25899- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-86c3-4264-rwhv No score
An issue was discovered in pdftools through 20200714. A NULL pointer dereference exists in the...
An issue was discovered in pdftools through 20200714. A NULL pointer dereference exists in the function Font::Size() located in font.cpp. It allows an attacker to cause Denial of Service.
- Record
GHSA-86c3-4264-rwhv- Weakness
- CWE-476
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-39542 is a medium vulnerability (CVSS 5.5) in Pdftools Project Pdftools, published September 20, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.64%, the 50th percentile. No source names a fixed version.