Is CVE-2020-25684 in the CISA KEV catalog?

No. CVE-2020-25684 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-25684?

CVE-2020-25684 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2020-25684?

CVE-2020-25684 has an EPSS score of 4.04% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-25684?

Upgrade dnsmasq on debian 11 to 2.83-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2020-25684

LOWEPSS 90th pctl

3.7

CVSS v3

NVD

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.

CWE-358

How to fix

Remediation Available

dnsmasqDebian

Fixed in:2.83-1CVE-2020-25684

dnsmasqUbuntu

Fixed in:2.75-1ubuntu0.16.04.7USN-4698-1

Fixed in:2.79-1ubuntu0.2USN-4698-1

Fixed in:2.80-1.1ubuntu1.2USN-4698-1

dnsmasq-baseUbuntu

Fixed in:2.75-1ubuntu0.16.04.7USN-4698-1

Fixed in:2.79-1ubuntu0.2USN-4698-1

Fixed in:2.80-1.1ubuntu1.2USN-4698-1

dnsmasq-utilsUbuntu

Fixed in:2.75-1ubuntu0.16.04.7USN-4698-1

Fixed in:2.79-1ubuntu0.2USN-4698-1

Fixed in:2.80-1.1ubuntu1.2USN-4698-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

4.04%probability of exploitation in 30 days

90thpercentile

Elevated risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

bugzilla.redhat.com

Third-Party Advisory5

Other references3

Related Vulnerabilities

Other CWE-358 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-1270	Critical	9.8	77%	-	Fix
CVE-2018-1275	Critical	9.8	58%	-	Fix
CVE-2024-7965	High	8.8	17%	KEV	Fix
CVE-2017-15663	High	7.5	13%	-	-
CVE-2016-10229	Critical	9.8	13%	-	Fix
CVE-2024-2174	High	8.8	13%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-04.