---
title: "CVE-2007-0493: Denial of service via unspecified vectors that cause \"dereference a freed fetch context\""
slug: "aa-00917"
description: "It is possible for the named to dereference (read) a freed fetch context. This can cause named to exit unintentionally."
updated: 2025-03-24T21:55:51Z
published: 2025-03-24T21:55:51Z
canonical: "kb.isc.org/aa-00917"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.isc.org/llms.txt
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# CVE-2007-0493: Denial of service via unspecified vectors that cause "dereference a freed fetch context"

A logic error can cause the named process to exit unintentionally.

CVE:

[CVE-2007-0493](http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0493)

Posting date:

30 Jan 2007

Program Impacted:

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

Versions affected:

9.3.0, 9.3.1, 9.3.2, 9.3.3, Alpha and Beta versions of 9.40, Alpha versions of 9.5.0

Severity:

Low

Exploitable:

Remotely

**Description:**

It is possible for the named to dereference (read) a freed fetch context. This can cause named to exit unintentionally.

**Workarounds:**

Disable or restrict recursion (to limit exposure).

**Active exploits:**

None known at this time.

**Solution:**

Upgrade to BIND 9.2.8, 9.3.4, or 9.4.0, or 9.5.0

**Related Documents:**

See our [BIND Security Matrix](https://kb.isc.org/docs/aa-00913) for a complete listing of Security Vulnerabilities and versions affected.

If you'd like more information on our Forum or product support please visit [www.isc.org/support](http://www.isc.org/support).

**Do you still have questions?** Questions regarding this advisory should go to [security-officer@isc.org](mailto:security-officer@isc.org)

**Note:** ISC patches only [currently supported versions](http://www.isc.org/software/bind/versions). When possible we indicate EOL versions affected.

**ISC Security Vulnerability Disclosure Policy:** Details of our current security advisory policy and practice can be found here: [https://www.isc.org/security-vulnerability-disclosure-policy](https://www.isc.org/security-vulnerability-disclosure-policy)

This Knowledge Base article [https://kb.isc.org/docs/aa-00917](https://kb.isc.org/docs/aa-00917) is the complete and official security advisory document.

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