CVE-2021-3448
- State
- Published
- Severity
- 4.0 Medium
- Published
- Apr 8, 2021
- Updated
- Dec 3, 2025
- Reserved
- Mar 16, 2021
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 4.0 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N | CISA-ADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
dnsmasqn/a |
|
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1939368
- FEDORA-2021-62a5062b2dvendor-advisory
- FEDORA-2021-9433bedebdvendor-advisory
- FEDORA-2021-5cd2571751vendor-advisory
- GLSA-202105-20vendor-advisory
- https://www.oracle.com/security-alerts/cpujan2022.html
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