Acceptance of Extraneous Untrusted Data With Trusted Data Affecting unbound package, versions [1.6.2,1.23.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published23 Jul 2025
- disclosed16 Jul 2025
- creditXiang Li
Introduced: 16 Jul 2025
NewCVE-2025-5994 (opens in a new tab)How to fix?
Upgrade unbound to version 1.23.1 or higher.
Overview
Affected versions of this package are vulnerable to Acceptance of Extraneous Untrusted Data With Trusted Data via the caching resolvers process. An attacker can send a valid query followed by non-ECS poisonous replies to try and guess the DNS transaction ID before the real answer from the upstream name server arrives.
Note:
This issue affects Unbound installations that are compiled with --enable-subnet and configured to send ECS information to upstream name servers with at least one of the send-client-subnet, client-subnet-zone or client-subnet-always-forward options.