GHSA-qcxh-w3j9-58qr · Severity: high · Ecosystem: maven — Apache Tomcat Denial of Service vulnerability
The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.
Conclusion & alert: CVE-2019-0199 is rated Moderate Risk (63.8/100): CVSS High severity, with high exploitation likelihood (EPSS 65.58%, 98th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-03-28 | 66.24% | 65.58% | -0.66% |
| 2 | 2026-03-04 | 38.29% | 66.24% | +27.95% |
| 3 | 2026-03-01 | — | 38.29% | — |
Full EPSS history (44 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.0 | HIGH |
|
3.9 | 3.6 | [email protected] |
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
GHSA-qcxh-w3j9-58qr · Severity: high · Ecosystem: maven — Apache Tomcat Denial of Service vulnerability
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2019-0199 not yet assigned priority: Debian including 1 source packages (tomcat9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2019-0199 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2019-0199 |
suse
|
medium | — | https://www.suse.com/security/cve/CVE-2019-0199/ |
ubuntu
|
medium | CVE-2019-0199 medium priority: Ubuntu including 2 source packages (tomcat8, tomcat9), 10 status rows across 5 suites (bionic, cosmic, trusty, upstream, xenial): released 4, DNE 3, not-affected 3. | https://ubuntu.com/security/CVE-2019-0199 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | tomcat | >= 8.5.0, <= 8.5.37 | cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* |
| apache | tomcat | >= 9.0.1, <= 9.0.14 | cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone1:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone16:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone17:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone18:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone19:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone2:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone20:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone21:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone3:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone4:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone5:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone6:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone7:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone8:*:*:*:*:*:* |
| apache | tomcat | 9.0.0 | cpe:2.3:a:apache:tomcat:9.0.0:milestone9:*:*:*:*:*:* |