Upstream information

CVE-2025-5994 at MITRE

Description

A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having important severity.

CVSS v3 Scores
  SUSE
Base Score 7.5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
CVSSv3 Version 3.1
CVSS v4 Scores
  CNA (NLnet Labs) SUSE
Base Score 8.7 8.7
Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:C/RE:X/U:X CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:C/RE:X/U:X
Attack Vector Network Network
Attack Complexity Low Low
Attack Requirements None None
Privileges Required None None
User Interaction None None
Vulnerable System Confidentiality Impact None None
Vulnerable System Integrity Impact High High
Vulnerable System Availability Impact None None
Subsequent System Confidentiality Impact None None
Subsequent System Integrity Impact None None
Subsequent System Availability Impact None None
CVSSv4 Version 4.0 4.0
SUSE Bugzilla entry: 1246625 [RESOLVED / INVALID]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Liberty Linux 8
  • python3-unbound >= 1.16.2-5.9.el8_10
  • unbound >= 1.16.2-5.9.el8_10
  • unbound-devel >= 1.16.2-5.9.el8_10
  • unbound-libs >= 1.16.2-5.9.el8_10
 Patchnames:
RHSA-2025:11884
SUSE Liberty Linux 9
  • python3-unbound >= 1.16.2-19.el9_6.1
  • unbound >= 1.16.2-19.el9_6.1
  • unbound-devel >= 1.16.2-19.el9_6.1
  • unbound-dracut >= 1.16.2-19.el9_6.1
  • unbound-libs >= 1.16.2-19.el9_6.1
 Patchnames:
RHSA-2025:11849
openSUSE Tumbleweed
  • libunbound8 >= 1.23.1-1.1
  • python3-unbound >= 1.23.1-1.1
  • unbound >= 1.23.1-1.1
  • unbound-anchor >= 1.23.1-1.1
  • unbound-devel >= 1.23.1-1.1
  • unbound-munin >= 1.23.1-1.1
 Patchnames:
openSUSE-Tumbleweed-2025-15435

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP6 unbound Not affected
SUSE Linux Enterprise Desktop 15 SP7 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP6 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP7 unbound Not affected
SUSE Linux Enterprise Micro 5.5 unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 unbound Not affected
SUSE Linux Enterprise Module for Package Hub 15 SP5 unbound Not affected
SUSE Linux Enterprise Module for Package Hub 15 SP6 unbound Not affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 unbound Not affected
SUSE Linux Enterprise Server 15 SP6 unbound Not affected
SUSE Linux Enterprise Server 15 SP7 unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 unbound Not affected
SUSE Linux Micro 6.0 unbound Not affected
SUSE Linux Micro 6.1 unbound Not affected
openSUSE Leap 15.6 unbound Not affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP3 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP3 unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP4 unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 unbound Not affected
SUSE Linux Enterprise Server 15 SP3 unbound Not affected
SUSE Linux Enterprise Server 15 SP3-LTSS unbound Not affected
SUSE Linux Enterprise Server 15 SP4 unbound Not affected
SUSE Linux Enterprise Server 15 SP4-LTSS unbound Not affected
SUSE Linux Enterprise Server 15 SP5 unbound Not affected
SUSE Linux Enterprise Server 15 SP5-LTSS unbound Not affected
SUSE Manager Proxy 4.3 unbound Not affected
SUSE Manager Proxy LTS 4.3 unbound Not affected
SUSE Manager Retail Branch Server 4.3 unbound Not affected
SUSE Manager Retail Branch Server LTS 4.3 unbound Not affected
SUSE Manager Server 4.3 unbound Not affected
SUSE Manager Server LTS 4.3 unbound Not affected
Products past their end of life and not receiving proactive updates anymore.
SUSE CaaS Platform 4.0 unbound Not affected
SUSE Enterprise Storage 6 unbound Not affected
SUSE Enterprise Storage 7 unbound Not affected
SUSE Enterprise Storage 7.1 unbound Not affected
SUSE Linux Enterprise Desktop 15 unbound Not affected
SUSE Linux Enterprise Desktop 15 SP1 unbound Not affected
SUSE Linux Enterprise Desktop 15 SP2 unbound Not affected
SUSE Linux Enterprise Desktop 15 SP3 unbound Not affected
SUSE Linux Enterprise Desktop 15 SP4 unbound Not affected
SUSE Linux Enterprise Desktop 15 SP5 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2 unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15-ESPOS unbound Not affected
SUSE Linux Enterprise High Performance Computing 15-LTSS unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 unbound Not affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 unbound Not affected
SUSE Linux Enterprise Module for Package Hub 15 SP3 unbound Not affected
SUSE Linux Enterprise Module for Package Hub 15 SP4 unbound Not affected
SUSE Linux Enterprise Real Time 15 SP2 unbound Not affected
SUSE Linux Enterprise Real Time 15 SP3 unbound Not affected
SUSE Linux Enterprise Real Time 15 SP4 unbound Not affected
SUSE Linux Enterprise Server 15 unbound Not affected
SUSE Linux Enterprise Server 15 SP1 unbound Not affected
SUSE Linux Enterprise Server 15 SP1-BCL unbound Not affected
SUSE Linux Enterprise Server 15 SP1-LTSS unbound Not affected
SUSE Linux Enterprise Server 15 SP2 unbound Not affected
SUSE Linux Enterprise Server 15 SP2-BCL unbound Not affected
SUSE Linux Enterprise Server 15 SP2-LTSS unbound Not affected
SUSE Linux Enterprise Server 15 SP3-BCL unbound Not affected
SUSE Linux Enterprise Server 15-LTSS unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 unbound Not affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 unbound Not affected
SUSE Manager Proxy 4.0 unbound Not affected
SUSE Manager Proxy 4.1 unbound Not affected
SUSE Manager Proxy 4.2 unbound Not affected
SUSE Manager Retail Branch Server 4.0 unbound Not affected
SUSE Manager Retail Branch Server 4.1 unbound Not affected
SUSE Manager Retail Branch Server 4.2 unbound Not affected
SUSE Manager Server 4.0 unbound Not affected
SUSE Manager Server 4.1 unbound Not affected
SUSE Manager Server 4.2 unbound Not affected
openSUSE Leap 15.3 unbound Not affected
openSUSE Leap 15.4 unbound Not affected
openSUSE Leap 15.5 unbound Not affected

SUSE Timeline for this CVE

CVE page created: Wed Jul 16 18:02:01 2025
CVE page last modified: Wed Aug 13 01:25:16 2025