cvedb.io
CVE-2021-43523
CRITICAL · CVSS 9.6
EPSS exploitation probability: 0%
Published 2021-11-10T15:15:12.213 · Last modified 2026-06-17T04:11:04.027

Summary

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.

Affected products

uclibc — uclibc

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.