Security Vulnerabilities

If you suspect you have found a security defect in BIND or DHCP, or if you wish to inquire about a security issue that you have learned about which has not yet been publicly announced, ISC encourages you to get in touch with our Security Officer by selecting the appropriate pull-down on the Bug Report Form.

Alternatively, you can email us at  However, plain-text e-mail is not a secure choice for communications concerning undisclosed security issues so we ask that you please encrypt your communications to us using the ISC Security Officer public key.

Learn more about Security Vulnerability Disclosure Policy at

Reporting a Bug

  • You may report BIND or DHCP bugs, or request features by using the Bug Report Form.

You may also use email, if you prefer:

  • To report a bug in BIND, other than a security issue, please contact us via
  • To report a bug in ISC DHCP, other than a security issue, please contact us via

For listing of security vulnerabilities about BIND 9, visit ISC’s Knowledge Base’s BIND 9 Vulnerabilities Matrix.

As of Oct, 2010 ISC is now using the CVSS, a program of and NIST, to determine the severity of potential security issues.

To subscribe to our Security Vulnerability RSS feed, please subscribe to updates from our knowledgebase at ISC Security Vulnerability RSS Feed


Summary:KSK-2010, the DNSSEC Key Signing Key that has served as the trust anchor for the root DNS zone (.) since it was introduced in 2010, is scheduled to be retired soon. A new key, KSK-2017, has been introduced and operators of validating resolvers should check their servers to ensure… [...]
Thu, Sep 28, 2017
Source: BIND Operational Notifications

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Last modified: November 3, 2016 at 2:19 pm