VDB
CVE-2021-3448
CVE-2021-3448
PUBLISHED
CVSS 4 MEDIUM
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.
EPSS 2.29% · 82.6th percentile
Risk Scores
CVSS 3.1
4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
EPSS Score
2.29%
82.6th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:20.04:LTS | dnsmasq | 2.80-1.1ubuntu1.3, 2.80-1.1ubuntu1.2, 0 |
| Ubuntu:18.04:LTS | dnsmasq | 2.78-3, 2.79-1ubuntu0.2, 2.79-1 |
| Ubuntu:Pro:16.04:LTS | dnsmasq | 2.75-1ubuntu0.16.04.2, 2.75-1ubuntu0.16.04.5, 2.75-1ubuntu0.16.04.7 |
| Ubuntu:Pro:14.04:LTS | dnsmasq | 2.67-1, *, 2.68-1ubuntu0.2 |
Timeline
- Apr 8, 2021 CVE Published
- Apr 14, 2021 EPSS Score
- Apr 27, 2021 EPSS Score
- Jun 11, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 25, 2021 EPSS Score
- Dec 28, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 8, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 3, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-3448 third-party-advisory
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2021q1/014835.html third-party-advisory
- https://ubuntu.com/security/notices/USN-4976-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-4976-2 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-3448 third-party-advisory