Bug 2367442 (CVE-2025-40775) - CVE-2025-40775 bind: DNS message with invalid TSIG causes an assertion failure
Summary: CVE-2025-40775 bind: DNS message with invalid TSIG causes an assertion failure
Keywords:
Status: NEW
Alias: CVE-2025-40775
Deadline: 2025-05-21
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-05-20 10:18 UTC by OSIDB Bzimport
Modified: 2025-05-30 01:59 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2025-05-20 10:18:41 UTC 
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. By sending specific messages to the server, an attacker can cause named to terminate unexpectedly.

- Authoritative servers are affected by this vulnerability.
- Resolvers are affected by this vulnerability.

Versions affected:
- 9.20.0 -> 9.20.8
- 9.21.0 -> 9.21.7

Fixed in:
- 9.20.9
- 9.21.8
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