CVE-1999-0077

Exp

Predictable TCP sequence numbers allow spoofing.

Published: 1995-01-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-1999-0077 is rated High Exploit Risk (74.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 30.87%, 98th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +18.75% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-1999-0077

EDB-ID Source Kind Published Link
19522 exploit_db edb 1999-09-27 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-1999-0077

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 12.13% 30.87% +18.75%
2 2026-04-16 15.62% 12.13% -3.49%
3 2025-03-30 — 15.62% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-1999-0077

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-1999-0077

OS Trackers for CVE-1999-0077

vendor priority summary link
alpine — CVE-1999-0077: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-1999-0077
redhat — — https://access.redhat.com/security/cve/CVE-1999-0077

Affected software / configurations for CVE-1999-0077

Vendor Product Version Raw CPE
microsoft windows_nt 4.0 cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*

References for CVE-1999-0077

cvelogic Threat Intelligence