Upstream information
Description
In NLnetLabs Unbound 1.20.0 up to and including 1.26.0, a vulnerability on the 'serve-expired' code path can cause a double decrement on the 'wait-limit' counter per client IP essentially bypassing one of the counter measures that was introduced for DNSBomb (CVE-2024-33655). A malicious actor can exploit this by controlling an authoritative zone with short TTL, so cached entries expire quickly. Each 'slow' query, one the attacker's authoritative never answers, is followed by one query for an expired cached name, which is answered immediately via the 'serve-expired' path and decrements the counter twice. This second query was named 'pump'. By alternating slow queries and pumps, the attacker keeps the per-client counter at or below the configured 'wait-limit' indefinitely, and can hold an arbitrary number of pending queries from a single source IP, up to the global mesh quota (num-queries-per-thread); eventually bypassing one of the counter measures introduced for DNSBomb (CVE-2024-33655). This vulnerability is present on the 'serve-expired' code path.SUSE information
Overall state of this security issue: New
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (NLnet Labs) |
|---|---|
| Base Score | 3.7 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | Low |
| CVSSv3 Version | 3.1 |
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Please note that this evaluation state might be work in progress, incomplete or outdated.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 SP7 | unbound | Analysis |
| SUSE Linux Enterprise Micro 5.5 | unbound | Analysis |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | unbound | Analysis |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP7 | unbound | Analysis |
| SUSE Linux Enterprise Server 16.0 | unbound | Analysis |
| SUSE Linux Enterprise Server 16.1 | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP applications 16.0 | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP applications 16.1 | unbound | Analysis |
| SUSE Linux Micro 6.0 | unbound | Analysis |
| SUSE Linux Micro 6.1 | unbound | Analysis |
| SUSE Linux Micro 6.2 | unbound | Analysis |
| openSUSE Leap 16.0 | unbound | Analysis |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | unbound | Analysis |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | unbound | Analysis |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | unbound | Analysis |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP4 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP4-LTSS | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP5 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP5-LTSS | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP6 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP6-LTSS | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | unbound | Analysis |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE CaaS Platform 4.0 | unbound | Analysis |
| SUSE Enterprise Storage 6 | unbound | Analysis |
| SUSE Enterprise Storage 7 | unbound | Analysis |
| SUSE Enterprise Storage 7.1 | unbound | Analysis |
| SUSE Linux Enterprise Desktop 15 SP1 | unbound | Analysis |
| SUSE Linux Enterprise Desktop 15 SP2 | unbound | Analysis |
| SUSE Linux Enterprise Desktop 15 SP3 | unbound | Analysis |
| SUSE Linux Enterprise Desktop 15 SP4 | unbound | Analysis |
| SUSE Linux Enterprise Desktop 15 SP5 | unbound | Analysis |
| SUSE Linux Enterprise Desktop 15 SP6 | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | unbound | Analysis |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | unbound | Analysis |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | unbound | Analysis |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | unbound | Analysis |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | unbound | Analysis |
| SUSE Linux Enterprise Module for Package Hub 15 SP3 | unbound | Analysis |
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | unbound | Analysis |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | unbound | Analysis |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | unbound | Analysis |
| SUSE Linux Enterprise Real Time 15 SP2 | unbound | Analysis |
| SUSE Linux Enterprise Real Time 15 SP3 | unbound | Analysis |
| SUSE Linux Enterprise Real Time 15 SP4 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP1 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP1-BCL | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP1-LTSS | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP2 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP2-BCL | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP2-LTSS | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP3 | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP3-BCL | unbound | Analysis |
| SUSE Linux Enterprise Server 15 SP3-LTSS | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | unbound | Analysis |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | unbound | Analysis |
| SUSE Manager Proxy 4.0 | unbound | Analysis |
| SUSE Manager Proxy 4.1 | unbound | Analysis |
| SUSE Manager Proxy 4.2 | unbound | Analysis |
| SUSE Manager Proxy 4.3 | unbound | Analysis |
| SUSE Manager Proxy LTS 4.3 | unbound | Analysis |
| SUSE Manager Retail Branch Server 4.0 | unbound | Analysis |
| SUSE Manager Retail Branch Server 4.1 | unbound | Analysis |
| SUSE Manager Retail Branch Server 4.2 | unbound | Analysis |
| SUSE Manager Retail Branch Server 4.3 | unbound | Analysis |
| SUSE Manager Retail Branch Server LTS 4.3 | unbound | Analysis |
| SUSE Manager Server 4.0 | unbound | Analysis |
| SUSE Manager Server 4.1 | unbound | Analysis |
| SUSE Manager Server 4.2 | unbound | Analysis |
| SUSE Manager Server 4.3 | unbound | Analysis |
| SUSE Manager Server LTS 4.3 | unbound | Analysis |
| openSUSE Leap 15.3 | unbound | Analysis |
| openSUSE Leap 15.4 | unbound | Analysis |
| openSUSE Leap 15.5 | unbound | Analysis |
| openSUSE Leap 15.6 | unbound | Analysis |
SUSE Timeline for this CVE
CVE page created: Thu Sep 17 16:07:23 2026CVE page last modified: Thu Sep 17 16:07:23 2026