How severe is CVE-2021-23386?

CVE-2021-23386 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2021-23386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-23386?

CVE-2021-23386 affects Dns-packet Project Dns-packet. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-23386?

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-2021-23386 published?

CVE-2021-23386 was published on 2021-05-20 and last updated on 2026-06-17.

CVE-2021-23386

CVE-2021-23386 is a high-severity vulnerability in Dns-packet Project Dns-packet with a CVSS 3.x base score of 7.7. 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-909.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v2: 4.0
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-909
Affected product: Dns-packet Project Dns-packet
Published: 2021-05-20
Last modified: 2026-06-17

Description

This affects the package dns-packet before 5.2.2. It creates buffers with allocUnsafe and does not always fill them before forming network packets. This can expose internal application memory over unencrypted network when querying crafted invalid domain names.

Frequently asked questions

What is CVE-2021-23386?: This affects the package dns-packet before 5.2.2. It creates buffers with allocUnsafe and does not always fill them before forming network packets. This can expose internal application memory over unencrypted network when querying crafted invalid domain names.
How severe is CVE-2021-23386?: CVE-2021-23386 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2021-23386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23386?: CVE-2021-23386 affects Dns-packet Project Dns-packet. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23386?: 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-2021-23386 published?: CVE-2021-23386 was published on 2021-05-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:dns-packet_project:dns-packet:*:*:*:*:*:node.js:*:*

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