CVE-1999-0323

CRITICAL

FreeBSD mmap function allows users to modify append-only or immutable files.

Affects 4 products across 4 vendors.

BCS7.31
CVSS 2.010.0
EPSS1.4%
Percentile69th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity.
◆ SAGE Intelligence — CITED Relevance Research Team

This vulnerability was disclosed in 1998. A critical vulnerability affects Bsdi systems (CVE-1999-0323). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-1998-GLOBAL-307777-C • Model: rule-based-v1 • Confidence: MEDIUM

Is this CVE in your environment?

BreachSpider monitors your ICS/OT environment for vulnerabilities like this one. No agents or network access required. Free to start.

Check My Environment →
Frequently Asked Questions
What is CVE-1999-0323?
This vulnerability was disclosed in 1998. A critical vulnerability affects Bsdi systems (CVE-1999-0323). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-1999-0323?
CVE-1999-0323 has CVSS 10.0 (Critical). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. EPSS: 1.4%.
Is CVE-1999-0323 actively exploited?
No confirmed active exploitation of CVE-1999-0323 as of 2026-05-30.
How do I remediate CVE-1999-0323?
Priority: MEDIUM.
What systems are affected by CVE-1999-0323?
CVE-1999-0323 affects: Bsdi, Freebsd, Netbsd, Openbsd.
Vulnerability Details
CVE IDCVE-1999-0323
BSIDBS-1998-GLOBAL-307777-C BreachSpider Global ID
CVSS VectorAV:N/AC:L/Au:N/C:C/I:C/A:C
Published1998-02-20
Last Modified2026-04-16
ICS Relevance0%
SourceNVD
Official Description

FreeBSD mmap function allows users to modify append-only or immutable files.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: FreeBSD mmap function allows users to modify append-only or immutable files. CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C.

Exploitation Likelihood: LOW

Affected Products
VendorProductFixed Version
Bsdi Bsd Os —
Freebsd Freebsd —
Netbsd Netbsd —
Openbsd Openbsd —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: July 2026 | Threat Age: 10376 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash33be506972860ed4e769c4cab03d86f5b58e77a71435e1d57ddeae14276b2dea8ae5956eb84158c9ccde8ca7d4a5a6bd14b3d62c0e57820e35034e0ddcad493e
Related CVEs affecting Bsdi
CVE-1999-0165 10.0 NFS cache poisoning. CVE-1999-0046 10.0 Buffer overflow of rlogin program using TERM environmental variable. CVE-1999-0099 10.0 Buffer overflow in syslog utility allows local or remote attackers to gain ro... CVE-1999-0047 10.0 MIME conversion buffer overflow in sendmail versions 8.8.3 and 8.8.4. CVE-1999-0042 10.0 Buffer overflow in University of Washington's implementation of IMAP and POP servers.
View all Bsdi CVEs →

Critical Severity - Know Your Exposure

A CVSS 10.0 vulnerability in your ICS environment cannot wait. BreachSpider maps critical CVEs to your specific assets and tells you what to fix first.

Check Your Assets Free →