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.

Published: 2009-05-22 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2009-1755 is rated Moderate Risk (46.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.79%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2009-1755

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 3.67% 1.79% -1.88%
2 2025-03-29 1.79% 3.67% +1.88%
3 2025-03-17 — 1.79% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2009-1755

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2009-1755

OS Trackers for CVE-2009-1755

vendor priority summary link
debian medium CVE-2009-1755 medium priority: Debian including 1 source packages (nsd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2009-1755
redhat medium — https://access.redhat.com/security/cve/CVE-2009-1755
ubuntu medium CVE-2009-1755 medium priority: Ubuntu including 2 source packages (nsd, nsd3), 20 status rows across 10 suites (dapper, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, oneiric, upstream): ignored 7, not-affected 7, DNE 3, released 3. https://ubuntu.com/security/CVE-2009-1755

Affected software / configurations for CVE-2009-1755

Vendor Product Version Raw CPE
nlnetlabs nsd 2.0.0 cpe:2.3:a:nlnetlabs:nsd:2.0.0:*:*:*:*:*:*:*
nlnetlabs nsd 2.0.1 cpe:2.3:a:nlnetlabs:nsd:2.0.1:*:*:*:*:*:*:*
nlnetlabs nsd 2.0.2 cpe:2.3:a:nlnetlabs:nsd:2.0.2:*:*:*:*:*:*:*
nlnetlabs nsd 2.1.0 cpe:2.3:a:nlnetlabs:nsd:2.1.0:*:*:*:*:*:*:*
nlnetlabs nsd 2.1.1 cpe:2.3:a:nlnetlabs:nsd:2.1.1:*:*:*:*:*:*:*
nlnetlabs nsd 2.1.2 cpe:2.3:a:nlnetlabs:nsd:2.1.2:*:*:*:*:*:*:*
nlnetlabs nsd 2.1.3 cpe:2.3:a:nlnetlabs:nsd:2.1.3:*:*:*:*:*:*:*
nlnetlabs nsd 2.1.4 cpe:2.3:a:nlnetlabs:nsd:2.1.4:*:*:*:*:*:*:*
nlnetlabs nsd 2.1.5 cpe:2.3:a:nlnetlabs:nsd:2.1.5:*:*:*:*:*:*:*
nlnetlabs nsd 2.3.7 cpe:2.3:a:nlnetlabs:nsd:2.3.7:*:*:*:*:*:*:*
nlnetlabs nsd 3.2.1 cpe:2.3:a:nlnetlabs:nsd:3.2.1:*:*:*:*:*:*:*

References for CVE-2009-1755

cvelogic Threat Intelligence