CVE-2021-31804: LeoCAD before 21.03 sometimes allows a use-after-free during the opening of a new document.

Q: How do I fix CVE-2021-31804?

leocad: upgrade to 21.03. Exact commands for each OS are on this page.

Q: Is CVE-2021-31804 being exploited?

CVE-2021-31804 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-2021-31804 affect?

CVE-2021-31804 affects leocad. Severity is medium (CVSS 5.5). LeoCAD before 21.03 sometimes allows a use-after-free during the opening of a new document.

Q: How urgent is CVE-2021-31804?

Priority 38/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2021-31804 is a medium-severity flaw (CVSS 5.5) affecting leocad. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LeoCAD before 21.03 sometimes allows a use-after-free during the opening of a new document.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-416
Published	2021-04-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: leocad

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

Am I affected?

Timeline

2021-04-26 08:15 UTCPublished CVE record published
2026-06-17 03:52 UTCUpdated Record last modified

leocad leocad UPGRADE

Affected: < 21.03

Fixed in: 21.03

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 21.03 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade leocad

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-2021-31804?

leocad: upgrade to 21.03. Exact commands for each OS are on this page.

Is CVE-2021-31804 being exploited?

CVE-2021-31804 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-2021-31804 affect?

CVE-2021-31804 affects leocad. Severity is medium (CVSS 5.5). LeoCAD before 21.03 sometimes allows a use-after-free during the opening of a new document.

How urgent is CVE-2021-31804?

Priority 38/100. Public exploit reference

References

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