CVE•Published 2020-12-03•Modified 2026-10-08•1 article on news•6 live references•NVD data
CVE-2020-17527Apache · Tomcat
Vulnerability data via NVD (ingested)
CVSS v3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS percentile
98
Exploit Prediction Scoring System · top 2% of all CVEs
Description
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.
Timeline
Published 2020-12-03
Modified 2026-10-08
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag3 hosts
vuln:CVE-2020-17527Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Apache Tomcat"All exposed Apache Tomcat instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Tomcat"HTTP body or banner mentions "Tomcat" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2020-17527Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2020-17527Censys host search filtered to this CVE id.
grep.app
CVE-2020-17527Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2020-17527GitHub code search for direct mentions.
Google dork
"CVE-2020-17527" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.