How severe is CVE-2018-1323?

CVE-2018-1323 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-1323 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 44% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1323?

CVE-2018-1323 affects Apache Tomcat Jk Connector. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-1323?

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-2018-1323 published?

CVE-2018-1323 was published on 2018-03-12 and last updated on 2026-06-17.

CVE-2018-1323

CVE-2018-1323 is a high-severity vulnerability in Apache Tomcat Jk Connector with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 44% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 44% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Apache Tomcat Jk Connector
Published: 2018-03-12
Last modified: 2026-06-17

Description

The IIS/ISAPI specific code in the Apache Tomcat JK ISAPI Connector 1.2.0 to 1.2.42 that normalised the requested path before matching it to the URI-worker map did not handle some edge cases correctly. If only a sub-set of the URLs supported by Tomcat were exposed via IIS, then it was possible for a specially constructed request to expose application functionality through the reverse proxy that was not intended for clients accessing Tomcat via the reverse proxy.

Frequently asked questions

What is CVE-2018-1323?: The IIS/ISAPI specific code in the Apache Tomcat JK ISAPI Connector 1.2.0 to 1.2.42 that normalised the requested path before matching it to the URI-worker map did not handle some edge cases correctly. If only a sub-set of the URLs supported by Tomcat were exposed via IIS, then it was possible for a specially constructed request to expose application functionality through the reverse proxy that was not intended for clients accessing Tomcat via the reverse proxy.
How severe is CVE-2018-1323?: CVE-2018-1323 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-1323 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 44% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1323?: CVE-2018-1323 affects Apache Tomcat Jk Connector. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-1323?: 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-2018-1323 published?: CVE-2018-1323 was published on 2018-03-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:tomcat_jk_connector:*:*:*:*:*:*:*:*

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