CVE-2020-25686

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Source
https://nvd.nist.gov/vuln/detail/CVE-2020-25686
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-25686.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2020-25686
Downstream
Related
Published
2021-01-20T17:15:13Z
Modified
2025-07-01T11:26:48.695605Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Alpine:v3.10 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Affected versions

2.*

2.46-r0
2.47-r0
2.49-r0
2.50-r0
2.50-r1
2.51-r0
2.52-r0
2.52-r1
2.55-r0
2.57-r0
2.58-r0
2.59-r0
2.59-r1
2.60-r0
2.61-r0
2.62-r0
2.63-r0
2.64-r0
2.65-r0
2.66-r0
2.66-r1
2.66-r2
2.67-r0
2.68-r0
2.69-r0
2.70-r0
2.71-r0
2.72-r0
2.72-r1
2.73-r0
2.75-r0
2.75-r1
2.75-r2
2.76-r0
2.76-r1
2.76-r2
2.76-r3
2.76-r4
2.77-r0
2.78-r0
2.78-r1
2.78-r2
2.79-r0
2.79-r1
2.79-r2
2.80-r0
2.80-r1
2.80-r2
2.80-r3
2.80-r4

Alpine:v3.11 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Affected versions

2.*

2.46-r0
2.47-r0
2.49-r0
2.50-r0
2.50-r1
2.51-r0
2.52-r0
2.52-r1
2.55-r0
2.57-r0
2.58-r0
2.59-r0
2.59-r1
2.60-r0
2.61-r0
2.62-r0
2.63-r0
2.64-r0
2.65-r0
2.66-r0
2.66-r1
2.66-r2
2.67-r0
2.68-r0
2.69-r0
2.70-r0
2.71-r0
2.72-r0
2.72-r1
2.73-r0
2.75-r0
2.75-r1
2.75-r2
2.76-r0
2.76-r1
2.76-r2
2.76-r3
2.76-r4
2.77-r0
2.78-r0
2.78-r1
2.78-r2
2.79-r0
2.79-r1
2.79-r2
2.80-r0
2.80-r1
2.80-r2
2.80-r3
2.80-r4
2.80-r5

Alpine:v3.12 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Affected versions

2.*

2.46-r0
2.47-r0
2.49-r0
2.50-r0
2.50-r1
2.51-r0
2.52-r0
2.52-r1
2.55-r0
2.57-r0
2.58-r0
2.59-r0
2.59-r1
2.60-r0
2.61-r0
2.62-r0
2.63-r0
2.64-r0
2.65-r0
2.66-r0
2.66-r1
2.66-r2
2.67-r0
2.68-r0
2.69-r0
2.70-r0
2.71-r0
2.72-r0
2.72-r1
2.73-r0
2.75-r0
2.75-r1
2.75-r2
2.76-r0
2.76-r1
2.76-r2
2.76-r3
2.76-r4
2.77-r0
2.78-r0
2.78-r1
2.78-r2
2.79-r0
2.79-r1
2.79-r2
2.80-r0
2.80-r1
2.80-r2
2.80-r3
2.80-r4
2.80-r5
2.81-r0

Alpine:v3.13 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Affected versions

2.*

2.46-r0
2.47-r0
2.49-r0
2.50-r0
2.50-r1
2.51-r0
2.52-r0
2.52-r1
2.55-r0
2.57-r0
2.58-r0
2.59-r0
2.59-r1
2.60-r0
2.61-r0
2.62-r0
2.63-r0
2.64-r0
2.65-r0
2.66-r0
2.66-r1
2.66-r2
2.67-r0
2.68-r0
2.69-r0
2.70-r0
2.71-r0
2.72-r0
2.72-r1
2.73-r0
2.75-r0
2.75-r1
2.75-r2
2.76-r0
2.76-r1
2.76-r2
2.76-r3
2.76-r4
2.77-r0
2.78-r0
2.78-r1
2.78-r2
2.79-r0
2.79-r1
2.79-r2
2.80-r0
2.80-r1
2.80-r2
2.80-r3
2.80-r4
2.80-r5
2.81-r0
2.81-r1
2.82-r0

Alpine:v3.14 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Affected versions

2.*

2.46-r0
2.47-r0
2.49-r0
2.50-r0
2.50-r1
2.51-r0
2.52-r0
2.52-r1
2.55-r0
2.57-r0
2.58-r0
2.59-r0
2.59-r1
2.60-r0
2.61-r0
2.62-r0
2.63-r0
2.64-r0
2.65-r0
2.66-r0
2.66-r1
2.66-r2
2.67-r0
2.68-r0
2.69-r0
2.70-r0
2.71-r0
2.72-r0
2.72-r1
2.73-r0
2.75-r0
2.75-r1
2.75-r2
2.76-r0
2.76-r1
2.76-r2
2.76-r3
2.76-r4
2.77-r0
2.78-r0
2.78-r1
2.78-r2
2.79-r0
2.79-r1
2.79-r2
2.80-r0
2.80-r1
2.80-r2
2.80-r3
2.80-r4
2.80-r5
2.81-r0
2.81-r1
2.82-r0

Alpine:v3.15 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Alpine:v3.16 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Alpine:v3.17 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Alpine:v3.18 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Alpine:v3.19 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Alpine:v3.20 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Alpine:v3.21 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Alpine:v3.22 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:apk/alpine/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-r0

Debian:11 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/debian/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/debian/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / dnsmasq

Package

Name
dnsmasq
Purl
pkg:deb/debian/dnsmasq?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.83-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}