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CVE-2020-25686

A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum o...

Published: Jan 20, 2021Updated: Nov 4, 2025 Sources: CVE List NVD BDU csafCWE-358
NVD MITRE
3.7CVSSLOW
EPSS Score
4.9%
Top 9.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Security researchers discovered and disclosed seven vulnerabilities in the open-source DNS component "dnsmasq", also known as "DNSpooq" vulnerabilities (CVE-2020-25681 through CVE-2020-25687). Three vulnerabilities (CVE-2020-25684 through CVE-2020-25686) affect the validation of DNS responses and impact several SCALANCE and RUGGEDCOM devices as listed below. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not available.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-358CWE-290

Affected Products

dnsmasqthekelleys
On-prem
Networking Infrastructure / dns-dhcp-ntp
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
debian linuxdebian
On-premOS
Operating Systems / linux-distro
eosaristaNetworking Infrastructure
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
thekelleysoss-projectNetworking Infrastructureaka dnsmasq, the kellys, thekelleys dnsmasq
fedoraprojectoss-projectUSOperating Systemsaka fedora project
debianoss-projectGBOperating Systemsaka debian gnu/linux
aristacommercialUSNetworking Infrastructure
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
and 7 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://cert-portal.siemens.com/productcert/csaf/ssa-646763.json
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/txt/ssa-646763.txt
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-646763.pdf
cert-portal.siemens.com
and 30 more references View all →

Timeline

Published
Jan 20, 2021
Last Updated
Nov 4, 2025

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