An issue existed in the parsing of URLs.

published 2021-04-02 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30774

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits: 0; none known

An issue existed in the parsing of URLs. This issue was addressed with improved input validation. This issue is fixed in macOS Server 5.11. Processing a maliciously crafted URL may lead to an open redirect or cross site scripting.

Patch / fix

fixed in 1

Apple macOS 5.11

Exploit prediction

0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	5.8	AV:N/AC:M/Au:N/C:P/I:P/A:N

Affected products

Apple macOS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-601 URL Redirection to Untrusted Site

References

support.apple.com /en-us/HT211932
vendor-advisory

Sources

CVE List CVE-2020-9995
NVD CVE-2020-9995

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary