OpenTrojan Intelligence Infrastructure
Search intelligence, CVEs, threats… Search
Ask AI Analyst API
English中文
Enter Portal

CVE-1999-1228: Various modems that do not implement a guard time, or are configured with a guard time of 0, can allow remote attackers

UNKNOWN

Published n/a Updated 2026-08-21T04:30:41.069Z

Summary

Various modems that do not implement a guard time, or are configured with a guard time of 0, can allow remote attackers to execute arbitrary modem commands such as ATH, ATH0, etc., via a "+++" sequence that appears in ICMP packets, the subject of an e-mail message, IRC commands, and others.

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: 2026-08-21T04:30:41.069Z · 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

6 reference(s) · attribution: NVD

Related Intelligence

Curated links only — no machine-generated relationships.

Investigate this vulnerability Ask AI about this CVE Research background

Start Investigation

Move from reading to investigating CVE-1999-1228: Various modems that do not implement a guard time, or are configured with a guard time of 0, can allow remote attackers . The workspace is a structured analysis surface — not a chat — organised as:

  1. Question — what do you need to know about CVE-1999-1228: Various modems that do not implement a guard time, or are configured with a guard time of 0, can allow remote attackers ?
  2. Evidence — assertions mapped to verifiable references.
  3. Timeline — events in chronological order.
  4. Related Entities — CVE, threat actor, campaign, malware links.
  5. Sources — NVD, CISA KEV, MITRE ATT&CK, vendor advisories.
  6. Notes — your own observations and working hypotheses.

AI assistance is limited to summarising, explaining, and suggesting related evidence. AI never completes your investigation, modifies entity relationships, or generates facts — all published analysis stays human-reviewed.

Start Investigation Open Workspace

Recommended Tools

  • CVE LookupOpen the full CVE record — severity, CVSS, affected products, CISA KEV and references.Open CVE record

Every tool runs passively or locally — inputs are never stored and no target is scanned.Start an investigation on this entity →