MEDIUM
CVE-1999-0856
NVD-CWE-OtherPublished: December 1, 1999· Updated: Jun 16, 2026
5.0
CVSS v3.1
Official Description
login in Slackware 7.0 allows remote attackers to identify valid users on the system by reporting an encryption error when an account is locked or does not exist.
Technical Analysis
CVE-1999-0856 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityNone
IntegrityP
AvailabilityNone
AV:N/AC:L/Au:N/C:N/I:P/A:N
Affected Vendors & Products
slackware1 product(s)
slackware linux
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
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PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (2)
Quick Facts
CVE IDCVE-1999-0856
CVSS Score5.0 / 10
SeverityMEDIUM
WeaknessNVD-CWE-Other
CISA KEVNo
Affected1 vendor(s)
PublishedDec 1, 1999
Related CVEs (NVD-CWE-Other)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-1999-0856 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.