Vulnerability · CVE-1999-1547

Oracle Web Listener 2.1 allows remote attackers to bypass access restrictions by replacing a character in the URL with its HTTP-encoded (hex) equivalent.

Published Nov 25, 1999 · corrected/updated Jun 16, 2026 · Oracle web listener · evidence confidence high

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-1999-1547 is a high public vulnerability record for Oracle web listener. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether Oracle web listener is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: oracle/web listener (2.1). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 7.5. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-20. Sources contributing to this record: oracle. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

Nov 25, 1999 · Oracle Critical Patch Updates
Detected
Oracle Web Listener 2.1 allows remote attackers to bypass access restrictions by replacing a character in the URL with its HTTP-encoded (hex) equivalent.
Jun 16, 2026 · Oracle Critical Patch Updates
Updated
Oracle Web Listener 2.1 allows remote attackers to bypass access restrictions by replacing a character in the URL with its HTTP-encoded (hex) equivalent.

Affected

cpe oracle/web listener2.1

Sources

Oracle Critical Patch UpdatesVendor advisoryCVE-1999-1547
Oracle Web Listener 2.1 allows remote attackers to bypass access restrictions by replacing a character in the URL with its HTTP-encoded (hex) equivalent.
nvd.nist.gov