CVE-2009-1755 Memory corruption in n/a
Remote attackers can cause a crash or execute arbitrary code via a buffer overflow in the NSD DNS server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2009-1755?
CVE-2009-1755 is a medium-severity memory corruption vulnerability in n/a, published on 22 May 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-189
Which versions are affected by CVE-2009-1755?
It affects 1 product.
Products include Nlnetlabs Nsd.
How do I fix CVE-2009-1755?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2009-1755 being exploited?
There is no known exploitation of CVE-2009-1755 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2026-12244 Heap overflow and crash with crafted SVCB RR
- CVE-2026-12245 Denial of DNS over TLS service by any DoT client
- CVE-2026-18664 Wrong interpretation of ACL ranges
- CVE-2026-19401 Remote UDP DoS by sending multiple DNS Cookie options
- CVE-2026-19538 Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS
Sources
Also known as DEBIAN-CVE-2009-1755, DSA-1803-1, GHSA-hvfw-j69f-c8f3.