Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U H N N 7.5 .2462 97.9 —
AFFECTED Product Versions Fixed Apache Tomcat Apache Tomcat 10 10.0.0-M1 to 10.0.0-M9 – —
TIMELINE Aug 12 Reserved by apache Dec 3 Published (CNA: apache) Oct 8 ENRICHED — CVE-2020-17527 (Apache Software Foundation Apache Tomcat). Received CVSS 7.5 and CPE data from NVD.
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.
| Date | Event | Detail |
|---|---|---|
| August 12, 2020 | Reserved | Reserved by apache |
| December 3, 2020 | Published | Published (CNA: apache) |
| October 8, 2026 | ENRICHED | ENRICHED — CVE-2020-17527 (Apache Software Foundation Apache Tomcat). Received CVSS 7.5 and CPE data from NVD. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | — | Apache Tomcat 10 10.0.0-M1 to 10.0.0-M9 | — |
Authoritative record: CVE-2020-17527 at cve.org
Vendors: apache
Weaknesses: CWE-200
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-17527 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
