CVE-2020-6621
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
- Record
CVE-2020-6621- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-125
- Updated
- 2026-11-02
CVE List No score
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
- Record
CVE-2020-6621- Updated
- 2026-11-02
EUVDEUVD-2020-27769 No score
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
- Record
EUVD-2020-27769- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-4pw6-3g9g-fxcr No score
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
- Record
GHSA-4pw6-3g9g-fxcr- Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-6621
stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
- Record
UBUNTU-CVE-2020-6621- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libstbUbuntu:20.04:LTS |
All versions, plus listed versions 0.0~git20190817.1.052dce1-1 |
None known |
libstbUbuntu:22.04:LTS |
All versions, plus listed versions 0.0~git20200713.b42009b+ds-10.0~git20210910.af1a5bc+ds-1 |
None known |
libstbUbuntu:24.04:LTS |
All versions, plus listed versions 0.0~git20230129.5736b15+ds-10.0~git20230129.5736b15+ds-1.10.0~git20230129.5736b15+ds-1.2 |
None known |
libstbUbuntu:25.10 |
All versions, plus listed versions 0.0~git20240715.f7f20f39fe4f+ds-10.0~git20241109.5c20573+ds-1 |
None known |
libstbUbuntu:26.10 |
All versions, plus listed versions 0.0~git20250907.fede005+ds-1 |
None known |
libstbUbuntu:26.04:LTS |
All versions, plus listed versions 0.0~git20241109.5c20573+ds-10.0~git20250907.fede005+ds-1 |
None known |
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-2020-6621 is a high vulnerability (CVSS 8.8) in Nothings Stb Truetype.h, published January 8, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.14%, the 66th percentile. No source names a fixed version.