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Critical severity9.6NVD Advisory· Published Nov 10, 2021· Updated Jun 17, 2026

CVE-2021-43523

CVE-2021-43523

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

5
  • Uclibc Ng/Uclibc Ng2 versions
    cpe:2.3:a:uclibc-ng_project:uclibc-ng:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:uclibc-ng_project:uclibc-ng:*:*:*:*:*:*:*:*range: <1.0.39
    • (no CPE)range: <1.0.39
  • Uclibc Ng/Uclibc2 versions
    cpe:2.3:a:uclibc:uclibc:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:uclibc:uclibc:*:*:*:*:*:*:*:*range: <=0.9.33.2
    • (no CPE)range: <1.0.39
  • uClibc/uClibc-ngdescription

Patches

Vulnerability mechanics

References

3

News mentions

0

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