CVE-2020-6623
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
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 an assertion failure in stbtt__cff_get_index.
- Record
CVE-2020-6623- 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-617
- Updated
- 2026-11-02
CVE List No score
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
- Record
CVE-2020-6623- Updated
- 2026-11-02
EUVDEUVD-2020-27771 No score
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
- Record
EUVD-2020-27771- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vv98-vgrj-89fm No score
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
- Record
GHSA-vv98-vgrj-89fm- Updated
- 2026-11-02
OSVUBUNTU-CVE-2020-6623
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
- Record
UBUNTU-CVE-2020-6623- 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-2020-6623 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 1.45%, the 73rd percentile. No source names a fixed version.