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 · catalog updated Jun 16, 2026 · Oracle web listener
Check if you run it
No confirmed exploitation is on record for CVE-1999-1547. EPSS is 9.67%. Act only if a listed version of Oracle web listener is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 9.67%
- Remediation
- Advisory link
- Affected products
- cpe oracle/web listener
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe oracle/web listener2.1
How to fix CVE-1999-1547
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-1999-1547. EPSS is 9.67%. Act only if a listed version of Oracle web listener is installed.
Which versions are affected?
Compare what you have installed with oracle/web listener 2.1. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-20: Improper Input Validation. EPSS 9.67%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
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.
Sources
- CVE.orgVulnerability recordCVE-1999-1547
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-1999-1547
30-day exploitation probability 9.7%
first.org - 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
References
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.