CVE-2021-45953

2022-01-0100:15:08

Debian Security Bug Tracker

security-tracker.debian.org

dnsmasq vulnerability heap-based overflow

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

9.5

Confidence

High

EPSS

0.002

Percentile

57.6%

JSON

Dnsmasq 2.86 has a heap-based buffer overflow in extract_name (called from hash_questions and fuzz_util.c). NOTE: the vendor’s position is that CVE-2021-45951 through CVE-2021-45957 "do not represent real vulnerabilities, to the best of our knowledge.

OSVersionArchitecturePackageVersionFilename
Debian12alldnsmasq<= 2.89-1dnsmasq_2.89-1_all.deb
Debian11alldnsmasq<= 2.85-1dnsmasq_2.85-1_all.deb
Debian999alldnsmasq<= 2.90-4dnsmasq_2.90-4_all.deb
Debian13alldnsmasq<= 2.90-4dnsmasq_2.90-4_all.deb

OS	Version	Architecture	Package	Version	Filename
Debian	12	all	dnsmasq	<= 2.89-1	dnsmasq_2.89-1_all.deb
Debian	11	all	dnsmasq	<= 2.85-1	dnsmasq_2.85-1_all.deb
Debian	999	all	dnsmasq	<= 2.90-4	dnsmasq_2.90-4_all.deb
Debian	13	all	dnsmasq	<= 2.90-4	dnsmasq_2.90-4_all.deb