CVE-2025-40776

EUVD-2025-21705
A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack.
This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.6 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 10.79%
Debian logo
Debian Releases
Debian Product
Codename
bind9
bookworm
1:9.18.49-1~deb12u1
fixed
bookworm (security)
1:9.18.49-1~deb12u2
fixed
bullseye
1:9.16.50-1~deb11u2
fixed
bullseye (security)
1:9.16.50-1~deb11u6
fixed
forky
1:9.20.27-1
fixed
sid
1:9.20.27-1
fixed
trixie
1:9.20.23-1~deb13u1
fixed
trixie (security)
1:9.20.26-1~deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
bind9
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
plucky
not-affected
trusty
not-affected
xenial
not-affected
bind9-libs
focal
not-affected
jammy
not-affected
noble
dne
plucky
dne
isc-dhcp
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
plucky
not-affected
trusty
not-affected
xenial
not-affected
Common Weakness Enumeration
References
https://kb.isc.org/docs/cve-2025-40776