CVE-1999-0502
HighExploitedPublic exploitA Unix account has a default, null, blank, or missing password.
Published Mar 1, 1998 · Updated Apr 15, 2026
Key Facts
Patch immediately- CVE-1999-0502 is a high-severity vulnerability (CVSS 7.5 v2) affecting Hp-Ux, Linux (Redhat), Solaris (Sun) and 1 more product.
- It is exploited in the wild, listed in Industry KEV feed since Nov 11, 2016. Public exploit code is available.
- EPSS estimates a 53% 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 listed as exploited in the wild.
CVSS v2
7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P
EPSS (30-day exploit likelihood)
53%
Higher than 98.9% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
A Unix account has a default, null, blank, or missing password.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 11, 2016 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
7 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Hp-UxHp | 10.20, 11 | n/a |
| LinuxRedhat | 6.0 | n/a |
| SolarisSun | 2.6 | n/a |
| SunosSun | 5.5.1, 5.7, 5.8 | n/a |
Timeline
Publicly disclosed
Mar 1, 1998
Added to Industry KEV feed
Nov 11, 2016
Last updated
Apr 15, 2026
References
FAQ
Common Questions.
A Unix account has a default, null, blank, or missing password.
Affected: Hp-Ux versions 10.20, 11; Linux (Redhat) versions 6.0; Solaris (Sun) versions 2.6, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Nov 11, 2016.
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 listed as exploited in the wild.
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