7.5

CVE-2025-30193: dnsdist Uncontrolled Recursion

CVSS: 7.5v3.1HighDeferred
AliasesSUSE-SU-2025:01745-1SUSE-SU-2025:01792-1UBUNTU-CVE-2025-30193
Published 20-05-2025Last modified 20-05-2025
Open JSON

Vulnerability summary

CVE-2025-30193 is a high (CVSS 7.5) Uncontrolled Recursion vulnerability in dnsdist. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.62%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
SUSE-SU-2025:01743-1USN-8037-1

Timeline

  1. 20-05-2025
    PublishedVulnerability first disclosed.
  2. 20-05-2025
    Last modifiedVulnerability information updated.

Description

In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.10 version. A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting. We would like to thank Renaud Allard for bringing this issue to our attention.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.62%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

0.00 pp

From 0.61% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.62%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Suse13 products
  • dnsdist&distro=SUSE Enterprise Storage 7.1< 1.8.0-150100.3.8.1
  • dnsdist&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS< 1.8.0-150400.9.6.1
  • dnsdist&distro=SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS< 1.8.0-150400.9.6.1
  • dnsdist&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS< 1.8.0-150400.9.6.1
  • dnsdist&distro=SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS< 1.8.0-150400.9.6.1
Debian1 product
  • dnsdistAll versions (No fix recorded) | < 1.9.10-1
Opensuse1 product
  • dnsdist&distro=openSUSE Leap 15.6< 1.8.0-150400.9.6.1
Ubuntu1 product
  • dnsdist< 1.6.1-1ubuntu0.1~esm2 | < 1.8.3-2ubuntu0.1~esm1

4 vendors · 16 products

References

11 links
Show all 11 references