How severe is CVE-2018-21028?

CVE-2018-21028 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-2018-21028 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21028?

CVE-2018-21028 affects Boa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-21028?

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-2018-21028 published?

CVE-2018-21028 was published on 2019-10-11 and last updated on 2026-06-17.

CVE-2018-21028

CVE-2018-21028 is a high-severity vulnerability in Boa 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-772.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-772
Affected product: Boa
Published: 2019-10-11
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2018-21028?: Boa through 0.94.14rc21 allows remote attackers to trigger a memory leak because of missing calls to the free function.
How severe is CVE-2018-21028?: CVE-2018-21028 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-2018-21028 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21028?: CVE-2018-21028 affects Boa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-21028?: 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-2018-21028 published?: CVE-2018-21028 was published on 2019-10-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:boa:boa:*:*:*:*:*:*:*:*

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Other CWE-772 vulnerabilities

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