CVE-2021-25219
Published: 27 October 2021
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.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
bind9 Launchpad, Ubuntu, Debian |
bionic |
Released
(1:9.11.3+dfsg-1ubuntu1.16)
|
| focal |
Released
(1:9.16.1-0ubuntu2.9)
|
|
| hirsute |
Released
(1:9.16.8-1ubuntu3.2)
|
|
| impish |
Released
(1:9.16.15-1ubuntu1.1)
|
|
| jammy |
Released
(1:9.16.15-1ubuntu2)
|
|
| trusty |
Released
(1:9.9.5.dfsg-3ubuntu0.19+esm5)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Needs triage
|
|
| xenial |
Released
(1:9.10.3.dfsg.P4-8ubuntu1.19+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.3 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |