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cve[email protected]CVE-2021-3448
HistoryApr 08, 2021 - 11:15 p.m.

CVE-2021-3448

2021-04-0823:15:12
CWE-358
web.nvd.nist.gov
1351
7
cve-2021-3448
dnsmasq
dns
cache poisoning
vulnerability

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS3

4

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

AI Score

4.1

Confidence

High

EPSS

0.002

Percentile

60.5%

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.

Affected configurations

Vulners
NVD
Node
dnsmasqdnsmasqRange2.85
VendorProductVersionCPE
dnsmasqdnsmasq*cpe:2.3:a:dnsmasq:dnsmasq:*:*:*:*:*:*:*:*

CNA Affected

[
  {
    "product": "dnsmasq",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "dnsmasq 2.85"
      }
    ]
  }
]

Social References

More

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS3

4

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

AI Score

4.1

Confidence

High

EPSS

0.002

Percentile

60.5%