CVE-2023-4408
bind9 - security update
7.5
HIGH
CVSS 3.1
EPSS 0.27%
Description
The DNS message parsing code in `named` includes a section whose computational complexity is overly high. It does not cause problems for typical DNS traffic, but crafted queries and responses may cause excessive CPU load on the affected `named` instance by exploiting this flaw. This issue affects both authoritative servers and recursive resolvers. This issue affects BIND 9 versions 9.0.0 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.
How to fix CVE-2023-4408
To remediate CVE-2023-4408, upgrade the affected package to a fixed version below.
- —upgrade to 9.16.48-r0 or later
- —upgrade to 1:9.16.48-1 or later
- —upgrade to 1:9.16.48-1 or later
Is CVE-2023-4408 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 9.16.48-r0
- from 0, < 1:9.16.48-1
- from 0, < 1:9.16.48-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |