CVE-2025-40775

CWE-232CWE-617 — Reachable Assertion9 documents8 sources
Severity
7.5HIGH
EPSS
0.2%
top 60.16%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
1
ISC Bind 9
Timeline
PublishedMay 21

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages3 packages

▶Alpinebind< 9.18.37-r0+5
▶Debianbind9< 1:9.20.9-1+1
▶CVEListV5isc/bind_99.20.0 — 9.20.8+1

🔴Vulnerability Details

4
OSV
CVE-2025-40775: When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it↗2025-05-21
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OSV
CVE-2025-40775: When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it↗2025-05-21
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GHSA
GHSA-gqgx-hgvf-f75f: When an incoming DNS protocol message includes a Transaction Signature (TSIG), BIND always checks it↗2025-05-21
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CVEList
DNS message with invalid TSIG causes an assertion failure↗2025-05-21
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📋Vendor Advisories

4
Ubuntu
Bind vulnerability↗2025-05-21
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Red Hat
bind: DNS message with invalid TSIG causes an assertion failure↗2025-05-21
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Microsoft
DNS message with invalid TSIG causes an assertion failure↗2025-05-13
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Debian
CVE-2025-40775: bind9 - When an incoming DNS protocol message includes a Transaction Signature (TSIG), B...↗2025
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