DEBIAN-CVE-2020-25684
- Source
- https://security-tracker.debian.org/tracker/CVE-2020-25684
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2020-25684.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2020-25684
- Upstream
- Published
- 2021-01-20T16:15:14Z
- Modified
- 2025-09-25T22:40:37Z
- 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 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.
- References
Affected packages
Debian:11 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source
Debian:12 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source
Debian:13 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source
Debian:14 / dnsmasq
Package
- Name
- dnsmasq
- Purl
- pkg:deb/debian/dnsmasq?arch=source