CVE-2021-43523
moderate-risk
Published 2021-11-10
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.
Do I need to act?
~
3.8% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.6/10
Critical
NETWORK
/ LOW complexity
Affected Products (2)
Uclibc
Uclibc-Ng
Affected Vendors
References (6)
Vendor Advisory
https://uclibc-ng.org/
Vendor Advisory
https://uclibc-ng.org/
46
/ 100
moderate-risk
Severity
32/34 · Critical
Exploitability
7/34 · Low
Exposure
7/34 · Low