What is CVE-1999-0524?

CVE-1999-0524 is a medium-severity vulnerability in Apple macOS, classified under Information Disclosure. CVSS score: 4.0/10. Published 1997-08-01.

How severe is CVE-1999-0524?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Is CVE-1999-0524 known to be exploited?

20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Apple macOS

CVE-1999-0524

ICMP information such as (1) netmask and (2) timestamp is allowed from arbitrary hosts.

Vulnerability class: Information Disclosure

Published 1997-08-01 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.322 (98.3th percentile), scored 2026-10-22.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.322 · newest: 0.322 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-200 — Information Disclosure

Public proof-of-concept exploits

References

exchange.xforce.ibmcloud.com/vulnerabilities/322 (VDB Entry, Third Party Advisory, vdb-entry)
kc.mcafee.com/corporate/index (Broken Link)
descriptions.securescout.com/tc/11010 (Broken Link)
exchange.xforce.ibmcloud.com/vulnerabilities/306 (VDB Entry, Third Party Advisory, vdb-entry)
descriptions.securescout.com/tc/11011 (Broken Link)
www.osvdb.org/95 (vdb-entry, Broken Link)
kb.vmware.com/selfservice/microsites/search.do (Third Party Advisory)
kb.juniper.net/InfoCenter/index (Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-1999-0524?: CVE-1999-0524 is a medium-severity vulnerability in Apple macOS, classified under Information Disclosure. CVSS score: 4.0/10. Published 1997-08-01.
How severe is CVE-1999-0524?: Medium severity. CVSS v3 base score is 4.0 out of 10.
Is CVE-1999-0524 known to be exploited?: 20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.