# CVE-1999-0524: Information disclosure in n/a

> Remote attackers can obtain sensitive network configuration details like netmask and timestamp from Azure Linux systems via ICMP.

- **Severity:** Medium 4.0 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Feb 2000
- **Updated:** 28 May 2026
- **Also known as:** AZL-6510, GHSA-5qg4-5cpf-4r9p

## What is CVE-1999-0524?

CVE-1999-0524 is a medium-severity vulnerability in Apple Mac Os X, published on 4 Feb 2000. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-1999-0524?

It affects 14 products.


Products: Apple Mac Os X, Apple Macos, Cisco Ios, Hp Hp-Ux, Hp Tru64, Ibm Aix, Ibm Os2, Linux kernel, Microsoft Windows, Novell Netware, Oracle Solaris, Sco Sco Unix, Sgi Irix, Windriver Bsdos.

## How do I fix CVE-1999-0524?

Apply the vendor's patch.

## Is CVE-1999-0524 being exploited?

There is no known exploitation of CVE-1999-0524 in the wild and no public exploit code.

Public exploit code:

- https://github.com/threatlabindonesia/CVE-1999-0524-ICMP-Timestamp-and-Address-Mask-Request-Exploit (github_poc): https://github.com/threatlabindonesia/CVE-1999-0524-ICMP-Timestamp-and-Address-Mask-Request-Exploit
- POC of CVE-1999-0524 (github_poc): https://github.com/biontdv/CVE-1999-0524-POC
- A reconnaissance tool to detect CVE-1999-0524 (ICMP Timestamp Disclosure) by automating timestamp extraction via nping or hping3. Converts raw ICMP timestamps into human-readable remote system times for vulnerability validation. (github_poc): https://github.com/Ransc0rp1on/ICMP-Timestamp-POC

## Other vulnerabilities in Apple Mac Os X

- [CVE-2014-7169](https://insights.sbomify.com/CVE-2014-7169/): GNU Bourne-Again Shell (Bash) Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2014-6271](https://insights.sbomify.com/CVE-2014-6271/): GNU Bourne-Again Shell (Bash) Arbitrary Code Execution (critical 9.8, exploited in the wild)
- [CVE-2012-1823](https://insights.sbomify.com/CVE-2012-1823/): PHP-CGI Query String Parameter (critical 9.8, exploited in the wild)
- [CVE-2021-30713](https://insights.sbomify.com/CVE-2021-30713/): Apple macOS Unspecified (high 7.8, exploited in the wild)
- [CVE-2019-8526](https://insights.sbomify.com/CVE-2019-8526/): Apple macOS Use-After-Free (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-1999-0524 and fix it if it is affected.

What it is: CVE-1999-0524 is a medium-severity vulnerability in Apple Mac Os X, published on 4 Feb 2000. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-1999-0524 in the wild and no public exploit code.

Affected product: Apple Mac Os X. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-1999-0524/ (Markdown: https://insights.sbomify.com/CVE-1999-0524/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-1999-0524
- NVD: https://nvd.nist.gov/vuln/detail/CVE-1999-0524
- OSV: https://osv.dev/vulnerability/CVE-1999-0524

---
From sbomify Insights: https://insights.sbomify.com/CVE-1999-0524/
Summaries are generated and may contain mistakes; the official description above is the record.