CVE-2021-25219: Lame cache can be abused to severely degrade resolver performance
In BIND 9.3.0 -> 9.11.35, 9.12.0 -> 9.16.21, and versions 9.9.3-S1 -> 9.11.35-S1 and 9.16.8-S1 -> 9.16.21-S1 of BIND Supported Preview Edition, as well as release versions 9.17.0 -> 9.17.18 of the BIND 9.17 development branch, exploitation of broken authoritative servers using a flaw in response processing can cause degradation in BIND resolver performance. The way the lame cache is currently designed makes it possible for its internal data structures to grow almost infinitely, which may cause significant delays in client query processing.
Affected Software
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Event History
Frequently Asked Questions
What is the vulnerability ID for this security vulnerability?
The vulnerability ID for this security vulnerability is CVE-2021-25219.
What is the severity level of CVE-2021-25219?
CVE-2021-25219 has a severity level of 5.3, which is considered medium.
Which software versions are affected by CVE-2021-25219?
The affected software versions include BIND 9.3.0 to 9.11.35, 9.12.0 to 9.16.21, and 9.9.3-S1 to 9.11.35-S1, as well as 9.16.8-S1 to 9.16.21-S1 and 9.17.0 to 9.17.18.
How can I fix the vulnerability in BIND?
To fix the vulnerability in BIND, you should update to the patched versions mentioned in the vendor's security advisory.
Where can I find more information about CVE-2021-25219?
More information about CVE-2021-25219 can be found in the Siemens ProductCERT document and the ISC Knowledge Base article.