What is CVE-2021-43523?

CVE-2021-43523 is a critical-severity vulnerability in Uclibc, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-11-10.

How severe is CVE-2021-43523?

Critical severity. CVSS v3 base score is 9.6 out of 10.

XSS in Uclibc

CVE-2021-43523

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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.033 (86.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Uclibc
Uclibc-ng_project Uclibc-ng
N/a — versions n/a

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)
cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (Exploit, Mailing List, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-43523?: CVE-2021-43523 is a critical-severity vulnerability in Uclibc, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-11-10.
How severe is CVE-2021-43523?: Critical severity. CVSS v3 base score is 9.6 out of 10.