CVE-2021-45955

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

Dnsmasq 2.86 has a heap-based buffer overflow in resize_packet (called from FuzzResizePacket and fuzz_rfc1035.c) because of the lack of a proper bounds check upon pseudo header re-insertion. 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." However, a contributor states that a security patch (mentioned in 016162.html) is needed

** EN DISPUTA ** Dnsmasq versión 2.86 presenta un desbordamiento de buffer en la región heap de la memoria en la función resize_packet (llamado desde FuzzResizePacket y fuzz_rfc1035.c). NOTA: la posición del proveedor es que CVE-2021-45951 a CVE-2021-45957 "no representan vulnerabilidades reales, según nuestro conocimiento". Sin embargo, un colaborador afirma que es necesario un parche de seguridad (mencionado en 016162.html)

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

Poc

Automatable

Yes

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2021-12-31 CVE Reserved
2021-12-31 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-09-15 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (4)

URL	Tag	Source
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/dnsmasq/OSV-2021-932.yaml	Third Party Advisory
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016162.html	Mailing List
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016164.html	Mailing List

URL	Date	SRC
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35898	2024-08-04

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Thekelleys Search vendor "Thekelleys"		Dnsmasq Search vendor "Thekelleys" for product "Dnsmasq"				2.86 Search vendor "Thekelleys" for product "Dnsmasq" and version "2.86"		-		Affected