How severe is CVE-2020-23109?

CVE-2020-23109 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2020-23109 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23109?

CVE-2020-23109 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23109?

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-2020-23109 published?

CVE-2020-23109 was published on 2021-11-03 and last updated on 2026-06-17.

CVE-2020-23109

CVE-2020-23109 is a high-severity vulnerability in Struktur Libheif with a CVSS 3.x base score of 8.1. 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Struktur Libheif
Published: 2021-11-03
Last modified: 2026-06-17

Description

Buffer overflow vulnerability in function convert_colorspace in heif_colorconversion.cc in libheif v1.6.2, allows attackers to cause a denial of service and disclose sensitive information, via a crafted HEIF file.

Frequently asked questions

What is CVE-2020-23109?: Buffer overflow vulnerability in function convert_colorspace in heif_colorconversion.cc in libheif v1.6.2, allows attackers to cause a denial of service and disclose sensitive information, via a crafted HEIF file.
How severe is CVE-2020-23109?: CVE-2020-23109 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2020-23109 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23109?: CVE-2020-23109 affects Struktur Libheif. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23109?: 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-2020-23109 published?: CVE-2020-23109 was published on 2021-11-03 and last updated on 2026-06-17.

References

https://github.com/strukturag/libheif/issues/207

Affected products (1)

cpe:2.3:a:struktur:libheif:1.6.2:*:*:*:*:*:*:*

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