CVE•Published 2021-03-01•Modified 2026-10-08•1 article on news•4 live references•NVD data
CVE-2021-25122Apache · 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
97
Exploit Prediction Scoring System · top 3% of all CVEs
Description
When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.
Timeline
Published 2021-03-01
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-2021-25122Hosts 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-2021-25122Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-25122Censys host search filtered to this CVE id.
grep.app
CVE-2021-25122Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-25122GitHub code search for direct mentions.
Google dork
"CVE-2021-25122" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (2)
CVE-2021-251222 repos
m3n0sd0n4ld/uCVEGo
uCVE is a tool written in GO that allows to extract CVE's related to a specific software and version, obtaining a report in HTML format with the result and/or exporting it to the p…
gocortexio/gocortexbrokenbankPython
GoCortex Broken Bank is an intentionally vulnerable app built to support Palo Alto Networks Cortex Cloud and XSIAM/XDR training. It provides a testing ground for CI/CD security val…