CVE•Published 2021-07-12•Modified 2026-10-08•1 article on news•6 live references•NVD data
CVE-2021-30640Apache · Tomcat
Vulnerability data via NVD (ingested)
CVSS v3.1
6.5
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS percentile
95
Exploit Prediction Scoring System · top 5% of all CVEs
Weaknesses (CWE)
Description
A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.
Timeline
Published 2021-07-12
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-2021-30640Hosts 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-2021-30640Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-30640Censys host search filtered to this CVE id.
grep.app
CVE-2021-30640Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-30640GitHub code search for direct mentions.
Google dork
"CVE-2021-30640" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2021-30640 on GitHub.