CVE-2021-43523

2021-11-1014:03:56

mitre

www.cve.org

uclibc

uclibc-ng

dns servers

domain hijacking

injection

remote code execution

xss

application crashes

validation step

AI Score

9.8

Confidence

High

EPSS

0.011

Percentile

84.2%

JSON

In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo, gethostbyaddr, and getnameinfo can lead to output of wrong hostnames (leading to domain hijacking) or injection into applications (leading to remote code execution, XSS, applications crashes, etc.). In other words, a validation step, which is expected in any stub resolver, does not occur.