How severe is CVE-2009-1086?

CVE-2009-1086 has a CVSS 2.0 base score of 6.4, rated medium severity.

Is CVE-2009-1086 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1086?

CVE-2009-1086 primarily affects Nlnetlabs Ldns. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1086?

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

When was CVE-2009-1086 published?

CVE-2009-1086 was published on 2009-03-25 and last updated on 2026-06-16.

CVE-2009-1086

CVE-2009-1086 is a medium-severity vulnerability in Nlnetlabs Ldns with a CVSS 2.0 base score of 6.4. 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-399.

Key facts

Severity: Medium (CVSS 2.0 base score 6.4)
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Nlnetlabs Ldns
Published: 2009-03-25
Last modified: 2026-06-16

Description

Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (memory corruption) and possibly execute arbitrary code via a DNS resource record (RR) with a long (1) class field (clas variable) and possibly (2) TTL field.

Frequently asked questions

What is CVE-2009-1086?: Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (memory corruption) and possibly execute arbitrary code via a DNS resource record (RR) with a long (1) class field (clas variable) and possibly (2) TTL field.
How severe is CVE-2009-1086?: CVE-2009-1086 has a CVSS 2.0 base score of 6.4, rated medium severity.
Is CVE-2009-1086 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1086?: CVE-2009-1086 primarily affects Nlnetlabs Ldns. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1086?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-1086 published?: CVE-2009-1086 was published on 2009-03-25 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:nlnetlabs:ldns:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:ldns:1.4.1:*:*:*:*:*:*:*

More vulnerabilities in Nlnetlabs Ldns

CVE-2017-1000232 — Critical (CVSS 9.8): A double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors.
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-2011-3581 — Medium (CVSS 6.8): Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote attackers…
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…

All CVEs affecting Nlnetlabs Ldns →

Other CWE-399 (Resource Management Errors) vulnerabilities

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CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →