CVE-2021-25219
moderate-risk
Published 2021-10-27
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.
Do I need to act?
~
1.0% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10
Medium
NETWORK
/ LOW complexity
Affected Products (20)
References (20)
Vendor Advisory
https://kb.isc.org/v1/docs/cve-2021-25219
Third Party Advisory
https://security.gentoo.org/glsa/202210-25
Third Party Advisory
https://security.netapp.com/advisory/ntap-20211118-0002/
Third Party Advisory
https://www.debian.org/security/2021/dsa-4994
Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html
Vendor Advisory
https://kb.isc.org/v1/docs/cve-2021-25219
Third Party Advisory
https://security.gentoo.org/glsa/202210-25
Third Party Advisory
https://security.netapp.com/advisory/ntap-20211118-0002/
Third Party Advisory
https://www.debian.org/security/2021/dsa-4994
Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html
48
/ 100
moderate-risk
Severity
21/34 · High
Exploitability
3/34 · Minimal
Exposure
24/34 · High