CVE-2021-28306: An issue was discovered in the fltk crate before 0.15.3 for Rust

Q: How do I fix CVE-2021-28306?

fltk: upgrade to 0.15.3. Exact commands for each OS are on this page.

Q: Is CVE-2021-28306 being exploited?

CVE-2021-28306 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-28306 affect?

CVE-2021-28306 affects fltk. Severity is high (CVSS 7.5). 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 multi label type if the image is nonexistent.

Q: How urgent is CVE-2021-28306?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2021-28306 is a high-severity flaw (CVSS 7.5) affecting fltk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 multi label type if the image is nonexistent.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-476
Published	2021-03-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fltk project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-03-12 09:15 UTCPublished CVE record published
2026-06-17 03:46 UTCUpdated Record last modified

fltk project fltk UPGRADE

Affected: < 0.15.3

Fixed in: 0.15.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy fltk || rpm -q fltk || fltk --version

2. UPGRADE to 0.15.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fltk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fltk

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-28306?

fltk: upgrade to 0.15.3. Exact commands for each OS are on this page.

Is CVE-2021-28306 being exploited?

CVE-2021-28306 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-28306 affect?

CVE-2021-28306 affects fltk. Severity is high (CVSS 7.5). 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 multi label type if the image is nonexistent.

How urgent is CVE-2021-28306?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-28308 CRITICAL 9.1 UPGRADE An issue was discovered in the fltk crate before 0.15.3 for Rust
CVE-2021-28307 HIGH 7.5 UPGRADE An issue was discovered in the fltk crate before 0.15.3 for Rust

References

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