---
title: "CVE-2003-0914: BIND: Negative Cache DOS (negcache)"
slug: "aa-00956"
description: "A maliciously configured name server can trick a resolver into caching false no-such-name responses for long periods of time."
updated: 2014-10-28T09:24:00Z
published: 2014-10-28T09:24:00Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.isc.org/llms.txt
> Use this file to discover all available pages before exploring further.

# CVE-2003-0914: BIND: Negative Cache DOS (negcache)

A maliciously configured name server can trick a resolver into caching false no-such-name responses for long periods of time.

```
          CVE: 

                [CVE-2003-0914](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0914)        

    

        
                  
          CERT: 

                [VU#734644](http://www.kb.cert.org/vuls/id/734644)        

    

        
                  
          Posting date: 

                04 Feb 2004        

    

        
                  
          Program Impacted: 

                [BIND](https://www.isc.org/software/bind)        

    

        
                  
          Versions affected: 

                All versions prior to 8.4.3 and 8.3.7, except some vendor-only releases        

    

        
                  
          Severity: 

                Serious        

    

        
                  
          Exploitable: 

                Remotely        

    

  Description: 

        
                An attacker would configure a name server to
```

return authoritative negative responses for a given target domain. Then, the attacker must convince a victim user to query the attacker's maliciously configured name server. When the attacker's name server receives the query, it will reply with an authoritative negative response containing a large TTL (time-to-live) value. If the victim's site runs a vulnerable version of BIND 8, it will cache the negative response and render the target domain unreachable until the TTL expires.

```
  Workarounds: 

        
                Disable recursion if possible, or limit recursion to specific clients. 

    

    

  Active exploits: 

        
                None known at this time.        

    

  Solution: 

        
                Upgrade to BIND 8.4.3 or later
```

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