CVE-1999-0399: The DCC server command in the Mirc 5.5 client doesn't filter characters from file names properly, allowing remote attack

UNKNOWN

Published n/a Updated 2026-08-21T04:30:41.719Z

Summary

The DCC server command in the Mirc 5.5 client doesn't filter characters from file names properly, allowing remote attackers to place a malicious file in a different location, possibly allowing the attacker to execute commands.

Why It Matters

UNKNOWN severity with CVSS n/a.

Risks left unpatched can lead to remote code execution, data exposure or lateral movement — verify exposure against the affected software below.

Current Status

  • Vulnerability status: Not listed in CISA KEV
  • Last intelligence update: 2026-08-21 · source: NVD

Entity Activity Timeline

  1. 2026-08-21 — Intelligence record updated(NVD sync)

No recorded activity beyond NVD publication and sync updates.

Severity

UNKNOWN

Source Attribution

Source: NVD · Updated: 2026-08-21T04:30:41.719Z · Confidence: high

Impact

Based on CVSS vector: n/a — assess confidentiality, integrity, and availability impact via the official vector documentation.

Affected Software

Fix

Upgrade affected software to the fixed version identified above. Apply vendor patches and monitor advisories before exposed systems go unpatched.

Sources & Evidence

2 reference(s) · attribution: NVD

Start Investigation

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  5. Sources — NVD, CISA KEV, MITRE ATT&CK, vendor advisories.
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