VDB-358962 · CVE-2026-33593 · Nessus 321078

PowerDNS DNSdist up to 1.9.12/2.0.3 DNSCrypt divide by zero

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in PowerDNS DNSdist up to 1.9.12/2.0.3. Affected is an unknown function of the component DNSCrypt. The manipulation results in divide by zero. This vulnerability is reported as CVE-2026-33593. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in PowerDNS DNSdist up to 1.9.12/2.0.3. It has been classified as problematic. Affected is some unknown functionality of the component DNSCrypt. The manipulation with an unknown input leads to a divide by zero vulnerability. CWE is classifying the issue as CWE-369. The product divides a value by zero. This is going to have an impact on availability. CVE summarizes:

A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query.

The weakness was disclosed by Haruto Kimura. The advisory is available at dnsdist.org. This vulnerability is traded as CVE-2026-33593 since 03/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 321078 (Fedora 44 : dnsdist (2026-51cdd1292b)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.9.13 or 2.0.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (321078). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Domain Name Software

Vendor

PowerDNS

Name

DNSdist

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Divide by zero
CWE: CWE-369 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 321078
Nessus Name: Fedora 44 : dnsdist (2026-51cdd1292b)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: DNSdist 1.9.13/2.0.4

Timelineinfo

03/23/2026 CVE reserved
04/22/2026 +29 days Advisory disclosed
04/22/2026 +0 days VulDB entry created
06/15/2026 +54 days VulDB entry last update

Sourcesinfo

Advisory: dnsdist.org
Researcher: Haruto Kimura
Status: Confirmed

CVE: CVE-2026-33593 (🔒)
GCVE (CVE): GCVE-0-2026-33593
GCVE (VulDB): GCVE-100-358962

Entryinfo

Created: 04/22/2026 17:29
Updated: 06/15/2026 13:40
Changes: 04/22/2026 17:29 (65), 06/15/2026 13:40 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.