CVE-2020-6623: nothings stb_truetype.h Reachable Assertion
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2020-6623
Published 08-01-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-6623 is a high (CVSS 8.8) Reachable Assertion vulnerability in nothings stb_truetype.h. EPSS estimates a 1.45% chance of exploitation in the next 30 days, higher than 73% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.45%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 08-01-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.45%
Chance of exploitation in the next 30 days
Percentile
73%
Versus all other CVEs
30-day change
0.00 pp
From 1.45% on 18-09-2026
18-09-202618-10-2026
EPSS score1.45%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundStb
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Nothings1 product
- stb_truetype.h≤ 1.22
Ubuntu1 product
- libstbAll versions (No fix recorded)
2 vendors · 2 products