How severe is CVE-2019-13207?

CVE-2019-13207 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-13207 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-2019-13207?

CVE-2019-13207 affects Nlnetlabs Name Server Daemon. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-13207?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-13207 published?

CVE-2019-13207 was published on 2019-07-03 and last updated on 2026-06-17.

CVE-2019-13207

CVE-2019-13207 is a critical-severity vulnerability in Nlnetlabs Name Server Daemon with a CVSS 3.x base score of 9.8. 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-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Nlnetlabs Name Server Daemon
Published: 2019-07-03
Last modified: 2026-06-17

Description

nsd-checkzone in NLnet Labs NSD 4.2.0 has a Stack-based Buffer Overflow in the dname_concatenate() function in dname.c.

Frequently asked questions

What is CVE-2019-13207?: nsd-checkzone in NLnet Labs NSD 4.2.0 has a Stack-based Buffer Overflow in the dname_concatenate() function in dname.c.
How severe is CVE-2019-13207?: CVE-2019-13207 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-13207 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-2019-13207?: CVE-2019-13207 affects Nlnetlabs Name Server Daemon. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-13207?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-13207 published?: CVE-2019-13207 was published on 2019-07-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nlnetlabs:name_server_daemon:4.2.0:*:*:*:*:*:*:*

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