Which products and versions are affected by CVE-1999-0016?

Affected: Inet (Gnu) versions 5.01; Winsock (Microsoft) versions 2.0; IOS (Cisco) versions 7000, among others. The full list is in the CVE brief.

Is CVE-1999-0016 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-1999-0016 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-1999-0016?

Public exploit code is available.

Is there a fix for CVE-1999-0016?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-1999-0016 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-1999-0016

MediumPublic exploit

Land IP denial of service.

Published Dec 1, 1997 · Updated Apr 15, 2026

Key Facts

Patch immediately

CVE-1999-0016 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Inet (Gnu), Winsock (Microsoft), IOS (Cisco) and 5 more products.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 96% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v2

5.0

AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS (30-day exploit likelihood)

96%

Higher than 99.8% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-1999-0016 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Land IP denial of service.

Affected Products

23 affected entries in total

Product	Affected versions	Fixed in
InetGnu	5.01	n/a
WinsockMicrosoft	2.0	n/a
IOSCisco	7000	n/a
Hp-UxHp	10.00, 10.01, 10.10, 10.16, 10.20, 10.24, 10.30, 11.00	n/a
Windows 95Microsoft	See advisory	n/a

3 more affected products in the full CVE brief

Timeline

Publicly disclosed
Dec 1, 1997
Last updated
Apr 15, 2026

References

2 more references in the full CVE brief

FAQ

Common Questions.

Land IP denial of service.
Affected: Inet (Gnu) versions 5.01; Winsock (Microsoft) versions 2.0; IOS (Cisco) versions 7000, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-1999-0016 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.