How severe is CVE-1999-1547?

CVE-1999-1547 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-1999-1547 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1547?

CVE-1999-1547 affects Oracle Web Listener. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1547?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-1999-1547 published?

CVE-1999-1547 was published on 1999-11-25 and last updated on 2026-06-16.

CVE-1999-1547

CVE-1999-1547 is a high-severity vulnerability in Oracle Web Listener with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 10% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Oracle Web Listener
Published: 1999-11-25
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-1999-1547?: CVE-1999-1547 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-1999-1547 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1547?: CVE-1999-1547 affects Oracle Web Listener. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1547?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-1999-1547 published?: CVE-1999-1547 was published on 1999-11-25 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:oracle:web_listener:2.1:*:*:*:*:*:*:*

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