# CVE-1999-0011: ISC BIND Denial of Service via CNAME and zone transfer

Source: https://junglewise.ai/threats/cve-1999-0011-isc-bind-denial-of-service-via-cname-and-zone-transfer  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 1998-04-08. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-1999-0011 · Severity: medium · CVSS 5.4 · Published 1998-04-08

A vulnerability in the BIND domain name service software can allow an attacker to disrupt internet name resolution services. By sending specially crafted requests related to CNAME records or zone transfers, an attacker can cause the service to become unresponsive. This could prevent users from accessing websites or internal network resources that rely on the affected DNS server.

Technologies: [Isc Bind](https://junglewise.ai/threats/technologies/bind). Vendors: [Isc](https://junglewise.ai/threats/vendors/isc).

## Quick answers

**Is CVE-1999-0011 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-1999-0011 being exploited in the wild.

**How severe is CVE-1999-0011?** Medium severity, with a CVSS score of 5.4, published 8 April 1998.

**Which products and versions are affected?** Isc Bind 4.9, 8.x.

**Is there a fix for CVE-1999-0011?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-1999-0011 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-1999-0011?** Check whether you run Isc Bind at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

BIND 4.9 and BIND 8 releases are susceptible to denial of service (DoS) attacks. The vulnerability is triggered through malformed or specific CNAME records and during zone transfer operations. An attacker can exploit this by sending malicious DNS queries or participating in zone transfers to crash the BIND daemon or cause it to hang. This results in a loss of DNS resolution capabilities for the network segment served by the affected host. Patches were historically released by various OS vendors including Sun, HP, and SGI to address these issues in their respective BIND distributions.

## Affected products

- ISC BIND 4.9, 8.x

## Timeline

- 1998-04-08: disclosed
- 1998-04-08: advisory

## References

- [http://sunsolve.sun.com/pub-cgi/retrieve.pl?doctype=coll&doc=secbull/180](http://sunsolve.sun.com/pub-cgi/retrieve.pl?doctype=coll&doc=secbull/180)
- [http://www1.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX9808-083](http://www1.itrc.hp.com/service/cki/docDisplay.do?docId=HPSBUX9808-083)

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