PowerDNS DNSdist up to 1.9.8 nghttp2 Provider use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability was found in PowerDNS DNSdist up to 1.9.8 and classified as critical. Impacted is an unknown function of the component nghttp2 Provider. Executing a manipulation can lead to use after free. This vulnerability is registered as CVE-2025-30194. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in PowerDNS DNSdist up to 1.9.8. It has been declared as critical. This vulnerability affects an unknown code of the component nghttp2 Provider. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by crafting a DoH exchange that triggers an illegal memory access (double-free) and crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.9 version. A workaround is to temporarily switch to the h2o provider until DNSdist has been upgraded to a fixed version. We would like to thank Charles Howes for bringing this issue to our attention.

The weakness was published by Charles Howes. The advisory is shared for download at dnsdist.org. This vulnerability was named CVE-2025-30194 since 03/18/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 236793 (Fedora 41 : dnsdist (2025-1d6a5aa3d8)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.9.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236793). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
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: 236793
Nessus Name: Fedora 41 : dnsdist (2025-1d6a5aa3d8)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: DNSdist 1.9.9

Timelineinfo

03/18/2025 🔍
04/29/2025 +41 days 🔍
04/29/2025 +0 days 🔍
05/17/2025 +18 days 🔍

Sourcesinfo

Advisory: dnsdist.org
Researcher: Charles Howes
Status: Confirmed

CVE: CVE-2025-30194 (🔍)
GCVE (CVE): GCVE-0-2025-30194
GCVE (VulDB): GCVE-100-306520

Entryinfo

Created: 04/29/2025 14:21
Updated: 05/17/2025 03:44
Changes: 04/29/2025 14:21 (65), 05/17/2025 03:44 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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