Vulnerabilities > CVE-2020-25686 - Improperly Implemented Security Check for Standard vulnerability in multiple products

CVSS 3.7 - LOW

Attack vector

NETWORK

Attack complexity

HIGH

Privileges required

NONE

Confidentiality impact

NONE

Integrity impact

LOW

Availability impact

NONE

network

high complexity

NVD

Published: 2021-01-20

Updated: 2023-11-07

Summary

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 of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

Vulnerable Configurations

Part	Description	Count
Application	Thekelleys Thekelleys Dnsmasq - Thekelleys Dnsmasq 0.4 Thekelleys Dnsmasq 0.5 Thekelleys Dnsmasq 0.6 Thekelleys Dnsmasq 0.7 Thekelleys Dnsmasq 0.95 Thekelleys Dnsmasq 0.96 Thekelleys Dnsmasq 0.98 Thekelleys Dnsmasq 0.992 Thekelleys Dnsmasq 0.996 Thekelleys Dnsmasq 1.0 Thekelleys Dnsmasq 1.2 Thekelleys Dnsmasq 1.3 Thekelleys Dnsmasq 1.4 Thekelleys Dnsmasq 1.5 Thekelleys Dnsmasq 1.6 Thekelleys Dnsmasq 1.7 Thekelleys Dnsmasq 1.8 Thekelleys Dnsmasq 1.9 Thekelleys Dnsmasq 1.10 Thekelleys Dnsmasq 1.11 Thekelleys Dnsmasq 1.12 Thekelleys Dnsmasq 1.13 Thekelleys Dnsmasq 1.14 Thekelleys Dnsmasq 1.15 Thekelleys Dnsmasq 1.16 Thekelleys Dnsmasq 1.17 Thekelleys Dnsmasq 1.18 Thekelleys Dnsmasq 2.0 Thekelleys Dnsmasq 2.1 Thekelleys Dnsmasq 2.2 Thekelleys Dnsmasq 2.3 Thekelleys Dnsmasq 2.4 Thekelleys Dnsmasq 2.5 Thekelleys Dnsmasq 2.6 Thekelleys Dnsmasq 2.7 Thekelleys Dnsmasq 2.8 Thekelleys Dnsmasq 2.9 Thekelleys Dnsmasq 2.10 Thekelleys Dnsmasq 2.11 Thekelleys Dnsmasq 2.12 Thekelleys Dnsmasq 2.13 Thekelleys Dnsmasq 2.14 Thekelleys Dnsmasq 2.15 Thekelleys Dnsmasq 2.16 Thekelleys Dnsmasq 2.17 Thekelleys Dnsmasq 2.18 Thekelleys Dnsmasq 2.19 Thekelleys Dnsmasq 2.20 Thekelleys Dnsmasq 2.21 Thekelleys Dnsmasq 2.22 Thekelleys Dnsmasq 2.23 Thekelleys Dnsmasq 2.24 Thekelleys Dnsmasq 2.25 Thekelleys Dnsmasq 2.26 Thekelleys Dnsmasq 2.27 Thekelleys Dnsmasq 2.28 Thekelleys Dnsmasq 2.29 Thekelleys Dnsmasq 2.30 Thekelleys Dnsmasq 2.31 Thekelleys Dnsmasq 2.33 Thekelleys Dnsmasq 2.34 Thekelleys Dnsmasq 2.35 Thekelleys Dnsmasq 2.36 Thekelleys Dnsmasq 2.37 Thekelleys Dnsmasq 2.38 Thekelleys Dnsmasq 2.39 Thekelleys Dnsmasq 2.40 Thekelleys Dnsmasq 2.41 Thekelleys Dnsmasq 2.42 Thekelleys Dnsmasq 2.43 Thekelleys Dnsmasq 2.44 Thekelleys Dnsmasq 2.45 Thekelleys Dnsmasq 2.46 Thekelleys Dnsmasq 2.47 Thekelleys Dnsmasq 2.48 Thekelleys Dnsmasq 2.49 Thekelleys Dnsmasq 2.50 Thekelleys Dnsmasq 2.51 Thekelleys Dnsmasq 2.52 Thekelleys Dnsmasq 2.53 Thekelleys Dnsmasq 2.54 Thekelleys Dnsmasq 2.55 Thekelleys Dnsmasq 2.56 Thekelleys Dnsmasq 2.57 Thekelleys Dnsmasq 2.58 Thekelleys Dnsmasq 2.59 Thekelleys Dnsmasq 2.60 Thekelleys Dnsmasq 2.61 Thekelleys Dnsmasq 2.62 Thekelleys Dnsmasq 2.63 Thekelleys Dnsmasq 2.64 Thekelleys Dnsmasq 2.65 Thekelleys Dnsmasq 2.66 Thekelleys Dnsmasq 2.67 Thekelleys Dnsmasq 2.68 Thekelleys Dnsmasq 2.69 Thekelleys Dnsmasq 2.70 Thekelleys Dnsmasq 2.71 Thekelleys Dnsmasq 2.72 Thekelleys Dnsmasq 2.73 Thekelleys Dnsmasq 2.74 Thekelleys Dnsmasq 2.75 Thekelleys Dnsmasq 2.76 Thekelleys Dnsmasq 2.77 Thekelleys Dnsmasq 2.78 Thekelleys Dnsmasq 2.79 Thekelleys Dnsmasq 2.80 Thekelleys Dnsmasq 2.81 Thekelleys Dnsmasq 2.82	110
OS	Fedoraproject Fedoraproject Fedora 32 Fedoraproject Fedora 33	2
OS	Debian Debian Debian Linux 10.0	1
OS	Arista Arista EOS 4.21 Arista EOS 4.21.0 Arista EOS 4.21.0F Arista EOS 4.21.1F Arista EOS 4.21.2.4 Arista EOS 4.21.3 Arista EOS 4.21.3F Arista EOS 4.21.4.1F Arista EOS 4.21.8 Arista EOS 4.21.8M Arista EOS 4.21.9M Arista EOS 4.21.11M Arista EOS 4.21.12M Arista EOS 4.21.13M Arista EOS 4.22.1F Arista EOS 4.23 Arista EOS 4.23.0F Arista EOS 4.23.1F Arista EOS 4.23.2F Arista EOS 4.23.3M Arista EOS 4.23.4M Arista EOS 4.23.5M Arista EOS 4.23.6M Arista EOS 4.24 Arista EOS 4.24.0 Arista EOS 4.24.0F Arista EOS 4.24.2.1F Arista EOS 4.24.2.4F Arista EOS 4.24.2F Arista EOS 4.24.3.1M Arista EOS 4.25 Arista EOS 4.25.0 Arista EOS 4.25.0F Arista EOS 4.25.1F	34

Common Weakness Enumeration (CWE)

CWE-358 - Improperly Implemented Security Check for Standard

Summary

Vulnerable Configurations

Common Weakness Enumeration (CWE)

References