CVE-2021-43523

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2021-43523
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-11-10 15:15:00 UTC
Updated2021-11-15 14:19:00 UTC
DescriptionIn 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.

Risk And Classification

Problem Types: CWE-79

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Uclibc Uclibc All All All All
Application Uclibc-ng Project Uclibc-ng All All All All

References

ReferenceSourceLinkTags
libc/inet/resolv.c: add __hnbad to check DNS entries for validity… · wbx-github/uclibc-ng@0f822af · GitHub MISC github.com
oss-security - [CVE-2021-43523] Incorrect handling of special characters in domain names in uclibc and uclibc-ng MISC www.openwall.com
Welcome to uClibc-ng! - Embedded C library MISC uclibc-ng.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 900338 Common Base Linux Mariner (CBL-Mariner) Security Update for uclibc-ng (6195)
  • 901751 Common Base Linux Mariner (CBL-Mariner) Security Update for uclibc-ng (6928-1)
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report