GHSA-fj7c-vg2v-ccrm · Severity: high · Ecosystem: maven — Undertow vulnerable to memory exhaustion due to buffer leak
A flaw was found in Undertow. A buffer leak on the incoming WebSocket PONG message may lead to memory exhaustion. This flaw allows an attacker to cause a denial of service. The highest threat from this vulnerability is availability.
Conclusion & alert: CVE-2021-3690 is rated High Exploit Risk (65.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.36%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
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 | 2026-06-06 | 0.33% | 0.36% | +0.03% |
| 2 | 2025-11-21 | 0.87% | 0.33% | -0.54% |
| 3 | 2025-11-18 | — | 0.87% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | [email protected] |
GHSA-fj7c-vg2v-ccrm · Severity: high · Ecosystem: maven — Undertow vulnerable to memory exhaustion due to buffer leak
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2021-3690 not yet assigned priority: Debian including 1 source packages (undertow), 2 status rows across 2 suites (forky, sid): resolved 2. | https://security-tracker.debian.org/tracker/CVE-2021-3690 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2021-3690 |
ubuntu
|
medium | CVE-2021-3690 medium priority: Ubuntu including 1 source packages (undertow), 15 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 7, ignored 5, DNE 3. | https://ubuntu.com/security/CVE-2021-3690 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| redhat | fuse | 1.0 | cpe:2.3:a:redhat:fuse:1.0:*:*:*:*:*:*:* |
| redhat | integration_camel_k | — | cpe:2.3:a:redhat:integration_camel_k:-:*:*:*:*:*:*:* |
| redhat | integration_camel_quarkus | — | cpe:2.3:a:redhat:integration_camel_quarkus:-:*:*:*:*:*:*:* |
| redhat | jboss_enterprise_application_platform | — | cpe:2.3:a:redhat:jboss_enterprise_application_platform:-:*:*:*:text-only:*:*:* |
| redhat | openshift_application_runtimes | — | cpe:2.3:a:redhat:openshift_application_runtimes:-:*:*:*:text-only:*:*:* |
| redhat | single_sign-on | — | cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:* |
| redhat | undertow | < 2.0.40 | cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:* |
| redhat | undertow | >= 2.1.0, < 2.2.10 | cpe:2.3:a:redhat:undertow:*:*:*:*:*:*:*:* |
| redhat | jboss_enterprise_application_platform | 7.3 | cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.3:*:*:*:*:*:*:* |
| redhat | jboss_enterprise_application_platform | 7.4 | cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.4:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2021-3690 | Vendor Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1991299 | Issue Tracking Vendor Advisory |
| https://github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877 | Patch Third Party Advisory |
| https://issues.redhat.com/browse/UNDERTOW-1935 | Exploit Issue Tracking Mitigation Vendor Advisory |