Vulnerability Details : CVE-2021-43523

Potential exploit
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.
Published 2021-11-10 15:15:12
Updated 2025-05-05 17:17:27
Source MITRE
View at NVD,   CVE.org
Vulnerability category: Cross site scripting (XSS)Execute code

Products affected by CVE-2021-43523

Exploit prediction scoring system (EPSS) score for CVE-2021-43523

EPSS FAQ
2.46%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 84 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-43523

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
6.8
 MEDIUM AV:N/AC:M/Au:N/C:P/I:P/A:P
8.6
6.4
 NIST
9.6
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
2.8
6.0
 134c704f-9b21-4f2e-91b3-4a467353bcc0 2025-05-05
9.6
 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
2.8
6.0
 NIST

CWE ids for CVE-2021-43523

References for CVE-2021-43523

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