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Vulnerability Intelligence

CVE-2025-40775

HIGH7.5

DNS message with invalid TSIG causes an assertion failure

Published May 21, 2025

Modified 7 months ago

No fix available

Details

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.

References

WEBhttp://www.openwall.com/lists/oss-security/2025/05/21/1 ADVISORYhttps://kb.isc.org/docs/cve-2025-40775 WEBhttps://security.netapp.com/advisory/ntap-20250523-0001/ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2025-40775

CVSS Analysis

CVSS v3.1

7.5

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

NoneC:N

Integrity

NoneI:N

Availability

HighA:H

7.5/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedMay 21, 2025

ModifiedMay 23, 2025

CVE-2025-40775 | Mondoo Vulnerability Intelligence