Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2020-25684 Details

Description

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, 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

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://bugzilla.redhat.com/show_bug.cgi?id=1889686 CVEIssue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html CVEMailing ListThird 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

see all 17 references

Weakness Enumeration

CWE-IDCWE NameSource
NVD-CWE-OtherWeakness Not in a Standard CWE Category[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
9.0
10.0

CPE

  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • 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

15 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2020-25684
NVD Published Date:
Jan 20, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2020-25684 Details - Not Deferred