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CVE-2020-17527.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSHIGH / 7.5CVSS 3.1 · nvd@nist.gov
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSModifiedModified Oct 08, 2026

Disclosure summary

While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.

Source-reported weakness categories

CWE-200

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

NIST National Vulnerability Database · NVD-CVE-2020-17527

Open original source · Updated Oct 08, 2026

Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.

VendorProduct / associationVersion / bounds
apachetomcat* {"versionStartIncluding":"9.0.1","versionEndIncluding":"9.0.35"}
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.0
apachetomcat9.0.35-3.39.1
apachetomcat9.0.35-3.57.3
apachetomcat9.0.36
apachetomcat9.0.37
apachetomcat9.0.38
apachetomcat9.0.39
apachetomcat10.0.0
apachetomcat10.0.0
apachetomcat10.0.0
apachetomcat10.0.0
apachetomcat10.0.0
apachetomcat10.0.0
apachetomcat10.0.0
apachetomcat10.0.0
apachetomcat10.0.0
netappelement_plug-in-
netapponcommand_system_manager* {"versionStartIncluding":"3.0.0","versionEndIncluding":"3.1.3"}
debiandebian_linux9.0
debiandebian_linux10.0
oracleblockchain_platform* {"versionEndExcluding":"21.1.2"}
oraclecommunications_cloud_native_core_binding_support_function1.10.0
oraclecommunications_cloud_native_core_policy1.14.0
oraclecommunications_instant_messaging_server10.0.1.5.0
oracleinstantis_enterprisetrack17.1
oracleinstantis_enterprisetrack17.2
oracleinstantis_enterprisetrack17.3
oraclemysql_enterprise_monitor* {"versionEndExcluding":"8.0.23"}
oraclesd-wan_edge9.0
oracleworkload_manager18c
oracleworkload_manager19c

Original records & references

PUBLISHED 2020-12-03T14:15:12-05:00
MODIFIED 2026-10-08T18:16:57-04:00
INGESTED 2026-10-10T20:50:19-04:00