NLnet Labs Unbound up to and including version 1.24.0 is vulnerable to possible domain hijack attacks. Promiscuous NS RRSets that complement positive DNS replies in the authority section can be used to trick resolvers to update their delegation information for the zone. Usually these RRSets are used to update the resolver's knowledge of the zone's name servers. A malicious actor can exploit the possible poisonous effect by injecting NS RRSets (and possibly their respective address records) in a reply. This could be done for example by trying to spoof a packet or fragmentation attacks. Unbound would then proceed to update the NS RRSet data it already has since the new data has enough trust for it, i.e., in-zone data for the delegation point. Unbound 1.24.1 includes a fix that scrubs unsolicited NS RRSets (and their respective address records) from replies mitigating the possible poison effect.
Metrics
Affected Vendors & Products
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History
Thu, 23 Oct 2025 10:30:00 +0000
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Nlnetlabs
Nlnetlabs unbound |
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Nlnetlabs
Nlnetlabs unbound |
Thu, 23 Oct 2025 00:15:00 +0000
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threat_severity
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cvssV3_1
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Wed, 22 Oct 2025 14:15:00 +0000
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ssvc
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Wed, 22 Oct 2025 13:00:00 +0000
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| Description | NLnet Labs Unbound up to and including version 1.24.0 is vulnerable to possible domain hijack attacks. Promiscuous NS RRSets that complement positive DNS replies in the authority section can be used to trick resolvers to update their delegation information for the zone. Usually these RRSets are used to update the resolver's knowledge of the zone's name servers. A malicious actor can exploit the possible poisonous effect by injecting NS RRSets (and possibly their respective address records) in a reply. This could be done for example by trying to spoof a packet or fragmentation attacks. Unbound would then proceed to update the NS RRSet data it already has since the new data has enough trust for it, i.e., in-zone data for the delegation point. Unbound 1.24.1 includes a fix that scrubs unsolicited NS RRSets (and their respective address records) from replies mitigating the possible poison effect. | |
| Title | Possible domain hijacking via promiscuous records in the authority section | |
| Weaknesses | CWE-349 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: NLnet Labs
Published: 2025-10-22T12:28:02.607Z
Updated: 2025-10-22T13:21:55.355Z
Reserved: 2025-10-07T09:07:44.926Z
Link: CVE-2025-11411
Updated: 2025-10-22T13:21:00.499Z
Status : Awaiting Analysis
Published: 2025-10-22T13:15:29.210
Modified: 2025-10-22T21:12:48.953
Link: CVE-2025-11411
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