How severe is CVE-2011-3581?

CVE-2011-3581 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2011-3581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-3581?

CVE-2011-3581 primarily affects Nlnetlabs Ldns. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-3581?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-3581 published?

CVE-2011-3581 was published on 2011-11-04 and last updated on 2026-06-16.

CVE-2011-3581

CVE-2011-3581 is a medium-severity vulnerability in Nlnetlabs Ldns with a CVSS 2.0 base score of 6.8. 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-119.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Nlnetlabs Ldns
Published: 2011-11-04
Last modified: 2026-06-16

Description

Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a Resource Record (RR) with an unknown type containing input that is longer than a specified length.

Frequently asked questions

What is CVE-2011-3581?: Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a Resource Record (RR) with an unknown type containing input that is longer than a specified length.
How severe is CVE-2011-3581?: CVE-2011-3581 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2011-3581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-3581?: CVE-2011-3581 primarily affects Nlnetlabs Ldns. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-3581?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-3581 published?: CVE-2011-3581 was published on 2011-11-04 and last updated on 2026-06-16.

References

Affected products (26)

cpe:2.3:a:nlnetlabs:ldns:*:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:0.50:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:0.60:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:0.65:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:0.66:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:0.70:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.1.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.2.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.2.2:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.3:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.5.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.5.1:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.1:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.2:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.3:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.4:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.5:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.6:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.7:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.8:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.6.9:*:*:*:*:*:*:*

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CVE-2017-1000231 — Critical (CVSS 9.8): A double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors.
CVE-2026-10846 — High (CVSS 7.5): NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks…
CVE-2020-19861 — High (CVSS 7.5): When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value…
CVE-2020-19860 — Medium (CVSS 6.5): When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read…
CVE-2009-1086 — Medium (CVSS 6.4): Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause…

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