CVE-2025-40775

When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it.  If the TSIG contains an invalid value in the algorithm field, BIND immediately aborts with an assertion failure.
This issue affects BIND 9 versions 9.20.0 through 9.20.8 and 9.21.0 through 9.21.7.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
iscCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA-ADPADP
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CVEADP
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 13%
Debian logo
Debian Releases
Debian Product
Codename
bind9
bullseye
1:9.16.50-1~deb11u2
not-affected
bookworm
1:9.18.33-1~deb12u2
not-affected
bullseye (security)
1:9.16.50-1~deb11u3
fixed
bookworm (security)
1:9.18.33-1~deb12u2
fixed
trixie
1:9.20.9-1
fixed
sid
1:9.20.9-2
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
bind9
plucky
Fixed 1:9.20.4-3ubuntu1.1
released
oracular
Fixed 1:9.20.0-2ubuntu3.2
released
noble
not-affected
jammy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
not-affected
bind9-libs
plucky
dne
oracular
dne
noble
dne
jammy
not-affected
focal
not-affected
isc-dhcp
plucky
not-affected
oracular
not-affected
noble
not-affected
jammy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
not-affected
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://kb.isc.org/docs/cve-2025-40775
http://www.openwall.com/lists/oss-security/2025/05/21/1
https://security.netapp.com/advisory/ntap-20250523-0001/