CVE-2020-19861

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too trusted for the length value obtained from the zone file. When the memcpy is copied, the 0xfe - ldns_rdf_size(salt_rdf) byte data can be copied, causing heap overflow information leakage.

Cuando es analizado un archivo de zona en ldns versión 1.7.1, la función ldns_nsec3_salt_data es demasiado confiable para el valor de longitud obtenido del archivo de zona. Cuando es copiado el memcpy, los datos de bytes 0xfe - ldns_rdf_size(salt_rdf) pueden ser copiados, causando un filtrado de información por desbordamiento de pila

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-08-13 CVE Reserved
2022-01-21 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-11-01 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (2)

URL	Tag	Source
https://cwe.mitre.org/data/definitions/126.html	Third Party Advisory

URL	Date	SRC
https://github.com/NLnetLabs/ldns/issues/51	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
Nlnetlabs Search vendor "Nlnetlabs"		Ldns Search vendor "Nlnetlabs" for product "Ldns"				1.7.1 Search vendor "Nlnetlabs" for product "Ldns" and version "1.7.1"		-		Affected