What is CVE-2018-21028?

CVE-2018-21028 is a high-severity vulnerability in Boa, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2019-10-11.

How severe is CVE-2018-21028?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Boa

CVE-2018-21028

Boa through 0.94.14rc21 allows remote attackers to trigger a memory leak because of missing calls to the free function.

Published 2019-10-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-772 — Missing Release of Resource after Effective Lifetime

References

github.com/gpg/boa/pull/1 (Third Party Advisory)
github.com/gpg/boa/pull/1/commits/e139b87835994d007fbd64eead6c1455d7b8cf4e (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-21028?: CVE-2018-21028 is a high-severity vulnerability in Boa, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 7.5/10. Published 2019-10-11.
How severe is CVE-2018-21028?: High severity. CVSS v3 base score is 7.5 out of 10.