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CVE-2025-30187

Denial of service via crafted DoH exchange in PowerDNS DNSdist

3.7 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.30%Up 0.3 points since Sep 18, 2025
90%50%10%1%

What each source reports

CVE List Score used 3.7

Denial of service via crafted DoH exchange in PowerDNS DNSdist

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.

Record
CVE-2025-30187
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-835
Updated
2026-11-02
EUVDEUVD-2025-30004 3.7

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.

Record
EUVD-2025-30004
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-2qmc-ch65-q9cm 3.7

In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming...

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.

Record
GHSA-2qmc-ch65-q9cm
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-835
Updated
2026-11-02
NVD 3.7

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.

Record
CVE-2025-30187
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-835
Updated
2026-11-02
OSVALPINE-CVE-2025-30187 3.7

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.

Record
ALPINE-CVE-2025-30187
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-03
OSV 3.7

Denial of service via crafted DoH exchange in PowerDNS DNSdist

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.

Record
CVE-2025-30187
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-835
Updated
2026-11-02
Show 6 moreShow less
OSVDEBIAN-CVE-2025-30187 3.7

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.

Record
DEBIAN-CVE-2025-30187
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2025-30187 3.7

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.

Record
UBUNTU-CVE-2025-30187
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVopenSUSE-SU-2026:20461-1 No score

Security update for dnsdist

This update for dnsdist fixes the following issues:

Update to dnsdist 1.9.11:

  • CVE-2025-8671: add mitigations for the HTTP/2 MadeYouReset attack (bsc#1253852).
  • CVE-2025-30187: denial of service via crafted DoH exchange (bsc#1250054).
Record
openSUSE-SU-2026:20461-1
Updated
2026-11-02
OSVSUSE-SU-2026:0888-1 No score

Security update for dnsdist

This update for dnsdist fixes the following issues:

Update to dnsdist 1.9.11:

  • CVE-2025-8671: Add mitigations for the HTTP/2 MadeYouReset attack (bsc#1253852).
  • CVE-2025-30187: denial of service via crafted DoH exchange (bsc#1250054).
Record
SUSE-SU-2026:0888-1
Updated
2026-11-02
OSVSUSE-SU-2026:20995-1 No score

Security update for dnsdist

This update for dnsdist fixes the following issues:

Update to dnsdist 1.9.11:

  • CVE-2025-8671: add mitigations for the HTTP/2 MadeYouReset attack (bsc#1253852).
  • CVE-2025-30187: denial of service via crafted DoH exchange (bsc#1250054).
Record
SUSE-SU-2026:20995-1
Updated
2026-11-02
OSVUSN-8037-1 No score

dnsdist vulnerabilities

It was discovered that HTTP/2, which is used/vendored by DNSdist, did not properly account for resources when handling client-triggered stream resets. An attacker could possibly use this issue to cause a denial of service. (CVE-2025-8671)

It was discovered that DNSdist did not properly manage memory limits when handling an unlimited number of queries on a single TCP connection. An attacker could possibly use this issue to cause a denial of service. (CVE-2025-30193)

It was discovered that DNSdist, when configured with the nghttp2 library, did not correctly process certain DNS over HTTPS queries. An attacker could possibly use this cause a denial of service. (CVE-2025-30187)

Record
USN-8037-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
dnsdist
Alpine:v3.23
 before 2.0.1-r0
2.0.1-r0
dnsdist
Alpine:v3.24
 before 2.0.1-r0
2.0.1-r0
dnsdist
Debian:13
 before 1.9.10-1+deb13u1, plus listed versions
1.9.10-1
1.9.10-1+deb13u1
dnsdist
Debian:14
 before 2.0.1-1, plus listed versions
1.9.10-12.0.0-12.0.0-22.0.0-32.0.0-4
Show 5 moreShow less
2.0.0-52.0.0-62.0.0~rc1-12.0.0~rc1-22.0.0~rc2-1
2.0.1-1
dnsdist
SUSE:Linux Enterprise Module for Basesystem 15 SP7
 before 1.9.11-150700.3.6.1
1.9.11-150700.3.6.1
dnsdist
SUSE:Linux Enterprise Server 16.0
 before 1.9.11-160000.1.1
1.9.11-160000.1.1
dnsdist
SUSE:Linux Enterprise Server for SAP applications 16.0
 before 1.9.11-160000.1.1
1.9.11-160000.1.1
dnsdist
Ubuntu:25.10
 before 1.9.10-1ubuntu0.1, plus listed versions
1.9.8-11.9.10-1
1.9.10-1ubuntu0.1
dnsdist
Ubuntu:Pro:22.04:LTS
 before 1.6.1-1ubuntu0.1~esm2, plus listed versions
1.5.1-3build21.6.1-1build11.6.1-1ubuntu0.1~esm1
1.6.1-1ubuntu0.1~esm2
dnsdist
Ubuntu:Pro:24.04:LTS
 before 1.8.3-2ubuntu0.1~esm1, plus listed versions
1.8.0-11.8.2-11.8.2-21.8.2-31.8.3-11.8.3-21.8.3-2build11.8.3-2build2
1.8.3-2ubuntu0.1~esm1
dnsdist
openSUSE:Leap 16.0
 before 1.9.11-160000.1.1
1.9.11-160000.1.1

History

History
RecordedChangedSources
affected, aliases, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-30187 is a low vulnerability (CVSS 3.7) in Powerdns Dnsdist, published September 18, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 23rd percentile. Fixed in dnsdist 2.0.1-r0.

References

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