NLnet Labs Unbound up to 1.24.0 acceptance of extraneous untrusted data with trusted data

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in NLnet Labs Unbound up to 1.24.0. Affected is an unknown function. Such manipulation leads to acceptance of extraneous untrusted data with trusted data. This vulnerability is documented as CVE-2025-11411. The attack requires being on the local network. There is not any exploit available.

Detailsinfo

A vulnerability was found in NLnet Labs Unbound up to 1.24.0 and classified as problematic. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a acceptance of extraneous untrusted data with trusted data vulnerability. Using CWE to declare the problem leads to CWE-349. The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted. Impacted is integrity, and availability. CVE summarizes:

NLnet Labs Unbound up to and including version 1.24.1 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. Unbound 1.24.2 includes an additional fix that scrubs unsolicited NS RRSets (and their respective address records) from YXDOMAIN and non-referral nodata replies, further mitigating the possible poison effect.

The weakness was released by Yuxiao Wu. The advisory is available at nlnetlabs.nl. This vulnerability is handled as CVE-2025-11411 since 10/07/2025. The exploitation is known to be easy. Access to the local network is required for this attack. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 01/08/2026).

The vulnerability scanner Nessus provides a plugin with the ID 271787 (Fedora 42 : unbound (2025-93d7b9a5d5)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (271787), EUVD (EUVD-2025-35360) and CERT Bund (WID-SEC-2025-2386). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • FreeBSD Project FreeBSD OS
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • SUSE openSUSE
  • OpenBSD OpenBSD
  • Open Source Unbound
  • Meinberg LANTIME
  • Securepoint UTM

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.4
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Acceptance of extraneous untrusted data with trusted data
CWE: CWE-349
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 271787
Nessus Name: Fedora 42 : unbound (2025-93d7b9a5d5)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/07/2025 CVE reserved
10/22/2025 +15 days Advisory disclosed
10/22/2025 +0 days VulDB entry created
01/08/2026 +78 days VulDB entry last update

Sourcesinfo

Advisory: nlnetlabs.nl
Researcher: Yuxiao Wu
Status: Confirmed

CVE: CVE-2025-11411 (🔒)
GCVE (CVE): GCVE-0-2025-11411
GCVE (VulDB): GCVE-100-329306
EUVD: 🔒
CERT Bund: WID-SEC-2025-2386 - Unbound: Schwachstelle ermöglicht Manipulation von Dateien

Entryinfo

Created: 10/22/2025 15:23
Updated: 01/08/2026 19:26
Changes: 10/22/2025 15:23 (64), 10/22/2025 15:30 (1), 10/27/2025 09:24 (7), 10/29/2025 01:52 (2), 10/29/2025 12:14 (1), 11/27/2025 05:34 (1), 12/01/2025 03:25 (1), 12/03/2025 15:59 (1), 12/05/2025 14:37 (1), 01/08/2026 19:26 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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