CVE-2021-3448
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-3448
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3448.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-3448
- Downstream
- Related
- Published
- 2021-04-08T23:15:12Z
- Modified
- 2025-08-09T19:01:28Z
- 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
-
- https://bugzilla.redhat.com/show_bug.cgi?id=1939368
- https://security.gentoo.org/glsa/202105-20
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CVTJUOFFFHINLKWAOC2ZSC5MOPD4SJ24/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/