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VULNERABILITIES

CVE-2020-25686 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://bugzilla.redhat.com/show_bug.cgi?id=1890125 CVEIssue TrackingPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/ CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/ CVE
https://security.gentoo.org/glsa/202101-17 CVEThird Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61 CVEThird Party Advisory

see all 15 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-290Authentication Bypass by Spoofing[email protected]
CWE-358Improperly Implemented Security Check for Standard[email protected]

Affected Products

ProductVersions
thekelleys dnsmasq
< 2.83

CPE

  • cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
fedoraproject fedora
32
33

CPE

  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
debian debian linux
10.0

CPE

  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
arista eos
>= 4.21, < 4.21.14m
>= 4.22, < 4.22.9m
>= 4.23, < 4.23.7m
>= 4.24, < 4.24.5m
>= 4.25, < 4.25.2f

CPE

  • cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

13 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-25686
NVD Published Date:
Jan 20, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2020-25686 Details - Not Deferred