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Ubuntu.comUB:CVE-2020-25687
HistoryJan 19, 2021 - 12:00 a.m.

CVE-2020-25687

2021-01-1900:00:00
ubuntu.com
ubuntu.com
4

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.1 High

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.087 Low

EPSS

Percentile

94.3%

A flaw was found in dnsmasq before version 2.83. A heap-based buffer
overflow was discovered in dnsmasq when DNSSEC is enabled and before it
validates the received DNS entries. This flaw allows a remote attacker, who
can create valid DNS replies, to cause an overflow in a heap-allocated
memory. This flaw is caused by the lack of length checks in
rfc1035.c:extract_name(), which could be abused to make the code execute
memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq,
resulting in a denial of service. The highest threat from this
vulnerability is to system availability.

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5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

7.1 High

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.087 Low

EPSS

Percentile

94.3%

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