How severe is CVE-2021-28307?

CVE-2021-28307 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-28307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28307?

CVE-2021-28307 affects Fltk Project Fltk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28307?

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-2021-28307 published?

CVE-2021-28307 was published on 2021-03-12 and last updated on 2026-06-17.

CVE-2021-28307

CVE-2021-28307 is a high-severity vulnerability in Fltk Project Fltk with a CVSS 3.x base score of 7.5. 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-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Fltk Project Fltk
Published: 2021-03-12
Last modified: 2026-06-17

Description

An issue was discovered in the fltk crate before 0.15.3 for Rust. There is a NULL pointer dereference during attempted use of a non-raster image for a window icon.

Frequently asked questions

What is CVE-2021-28307?: An issue was discovered in the fltk crate before 0.15.3 for Rust. There is a NULL pointer dereference during attempted use of a non-raster image for a window icon.
How severe is CVE-2021-28307?: CVE-2021-28307 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-28307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28307?: CVE-2021-28307 affects Fltk Project Fltk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28307?: 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-2021-28307 published?: CVE-2021-28307 was published on 2021-03-12 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2021-0038.html

Affected products (1)

cpe:2.3:a:fltk_project:fltk:*:*:*:*:*:rust:*:*

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