CVE-1999-0513
MediumPublic exploitICMP messages to broadcast addresses are allowed, allowing for a Smurf attack that can cause a denial of service.
Published Jan 5, 1998 · Updated Apr 15, 2026
Key Facts
Patch immediately- CVE-1999-0513 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Unix (Digital), Freebsd, Hp-Ux and 5 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 71% 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)
71%
Higher than 99.3% 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-1999-0513 brief as a PDF
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Description
ICMP messages to broadcast addresses are allowed, allowing for a Smurf attack that can cause a denial of service.
Affected Products
33 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| UnixDigital | 3.2g, 4.0, 4.0a, 4.0b, 4.0c, 4.0d | n/a |
| FreebsdFreebsd | 1.1.5.1, 2.0.5, 2.1.0, 2.1.5, 2.1.6, 2.1.7.1, 2.2.2, 2.2.3 | n/a |
| Hp-UxHp | 10.20, 11.00 | n/a |
| AixIbm | 3.1, 3.2, 3.2.4, 3.2.5 | n/a |
| Linux KernelLinux | 2.0, 2.1 | n/a |
Timeline
Publicly disclosed
Jan 5, 1998
Last updated
Apr 15, 2026
References
FAQ
Common Questions.
ICMP messages to broadcast addresses are allowed, allowing for a Smurf attack that can cause a denial of service.
Affected: Unix (Digital) versions 3.2g, 4.0, 4.0a, 4.0b, 4.0c, 4.0d; Freebsd versions 1.1.5.1, 2.0.5, 2.1.0, 2.1.5, 2.1.6, 2.1.7.1, 2.2.2, 2.2.3; Hp-Ux versions 10.20, 11.00, 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.
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