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Ubuntu 14.04 LTS: Bind9 Critical DoS Vulnerabilities USN-7739-1

ubuntu
Calendar Grey September 10, 2025
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-7740-1 outlines various vulnerabilities addressed in OpenSSH that may lead to unauthorized access.
Several security issues were fixed in Bind.

Summary

Several security issues were fixed in Bind.

Software Description:

- bind9: Internet Domain Name Server

Details:

Greg Kuechle discovered that Bind incorrectly handled certain incremental

zone updates. A remote attacker could possibly use this issue to cause Bind

to crash, resulting in a denial of service. (CVE-2021-25214)

Siva Kakarla discovered that Bind incorrectly handled certain DNAME

records. A remote attacker could possibly use this issue to cause Bind to

crash, resulting in a denial of service. (CVE-2021-25215)

It was discovered that Bind incorrectly handled GSSAPI security policy

negotiation. A remote attacker could use this issue to cause Bind to crash,

resulting in a denial of service, or possibly execute arbitrary code.

(CVE-2021-25216)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu system update bind9

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS
  bind9                           1:9.9.5.dfsg-3ubuntu0.19+esm13
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7739-1

CVE-2021-25214, CVE-2021-25215, CVE-2021-25216

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7739-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu system update bind9

Package Information

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