DEBIAN-CVE-2021-3448
- Source
- https://security-tracker.debian.org/tracker/CVE-2021-3448
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3448.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2021-3448
- Upstream
- Published
- 2021-04-08T23:15:12Z
- Modified
- 2025-09-25T22:40:42Z
- Severity
-
- 4.0 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS Calculator
- Summary
- [none]
- Details
-
A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. 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