CVE-2020-6623
CVE-2020-6623 is a high-severity vulnerability in Nothings Stb Truetype.h with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-617.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- CVSS v2: 6.8
- EPSS exploit prediction: 1% (70th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-617
- Affected product: Nothings Stb Truetype.h
- Published:
- Last modified:
Description
stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
Frequently asked questions
- What is CVE-2020-6623?
- stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_get_index.
- How severe is CVE-2020-6623?
- CVE-2020-6623 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-6623 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-6623?
- CVE-2020-6623 affects Nothings Stb Truetype.h. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-6623?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-6623 published?
- CVE-2020-6623 was published on 2020-01-08 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:nothings:stb_truetype.h:*:*:*:*:*:*:*:*
More vulnerabilities in Nothings Stb Truetype.h
- CVE-2020-6622 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has a heap-based buffer over-read in stbtt__buf_peek8.
- CVE-2020-6621 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.
- CVE-2020-6620 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has a heap-based buffer over-read in stbtt__buf_get8.
- CVE-2020-6619 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__buf_seek.
- CVE-2020-6618 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has a heap-based buffer over-read in stbtt__find_table.
- CVE-2020-6617 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_int.
All CVEs affecting Nothings Stb Truetype.h →
Other CWE-617 (Reachable Assertion) vulnerabilities
- CVE-2020-3615 — Critical (CVSS 9.8): Valid deauth/disassoc frames is dropped in case if RMF is enabled and some rouge peer keep on sending rogue…
- CVE-2019-9795 — Critical (CVSS 9.8): A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by…
- CVE-2026-31739 — High (CVSS 8.8): In the Linux kernel, the following vulnerability has been resolved: crypto: tegra - Add missing CRYPTO_ALG_ASYNC The…
- CVE-2020-12417 — High (CVSS 8.8): Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in…
- CVE-2020-6619 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__buf_seek.
- CVE-2020-6617 — High (CVSS 8.8): stb stb_truetype.h through 1.22 has an assertion failure in stbtt__cff_int.