PowerDNS DNSdist up to 1.9.10/2.0.0 nghttp2 infinite loop

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability was found in PowerDNS DNSdist up to 1.9.10/2.0.0 and classified as problematic. The impacted element is an unknown function of the component nghttp2. The manipulation results in infinite loop. This vulnerability is cataloged as CVE-2025-30187. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in PowerDNS DNSdist up to 1.9.10/2.0.0. Affected is an unknown code of the component nghttp2. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. CVE summarizes:

In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.

The advisory is shared for download at dnsdist.org. This vulnerability is traded as CVE-2025-30187 since 03/18/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 265571 (Linux Distros Unpatched Vulnerability : CVE-2025-30187), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.9.11 or 2.0.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (265571) and CERT Bund (WID-SEC-2025-2112). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.7
CNA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265571
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-30187

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: DNSdist 1.9.11/2.0.1

Timelineinfo

03/18/2025 CVE reserved
09/18/2025 +183 days Advisory disclosed
09/18/2025 +0 days VulDB entry created
09/24/2025 +6 days VulDB entry last update

Sourcesinfo

Advisory: dnsdist.org
Status: Confirmed

CVE: CVE-2025-30187 (🔒)
GCVE (CVE): GCVE-0-2025-30187
GCVE (VulDB): GCVE-100-324804
CERT Bund: WID-SEC-2025-2112 - DNSdist: Schwachstelle ermöglicht Denial of Service

Entryinfo

Created: 09/18/2025 12:22
Updated: 09/24/2025 12:49
Changes: 09/18/2025 12:22 (64), 09/20/2025 21:53 (2), 09/24/2025 12:49 (6)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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