How severe is CVE-2009-1755?

CVE-2009-1755 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-1755 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1755?

CVE-2009-1755 primarily affects Nlnetlabs Nsd. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1755?

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

When was CVE-2009-1755 published?

CVE-2009-1755 was published on 2009-05-22 and last updated on 2026-06-16.

CVE-2009-1755

CVE-2009-1755 is a medium-severity vulnerability in Nlnetlabs Nsd with a CVSS 2.0 base score of 5.0. 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-189.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Nlnetlabs Nsd
Published: 2009-05-22
Last modified: 2026-06-16

Description

Off-by-one error in the packet_read_query_section function in packet.c in nsd 3.2.1, and process_query_section in query.c in nsd 2.3.7, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors that trigger a buffer overflow.

Frequently asked questions

What is CVE-2009-1755?: Off-by-one error in the packet_read_query_section function in packet.c in nsd 3.2.1, and process_query_section in query.c in nsd 2.3.7, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors that trigger a buffer overflow.
How severe is CVE-2009-1755?: CVE-2009-1755 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-1755 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1755?: CVE-2009-1755 primarily affects Nlnetlabs Nsd. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1755?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-1755 published?: CVE-2009-1755 was published on 2009-05-22 and last updated on 2026-06-16.

References

Affected products (11)

cpe:2.3:a:nlnetlabs:nsd:2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.1.0:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.1.3:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.1.4:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.1.5:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:2.3.7:*:*:*:*:*:*:*
cpe:2.3:a:nlnetlabs:nsd:3.2.1:*:*:*:*:*:*:*

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