CVE-2021-3859
HIGHCVSS 7.5/10EPSS 1.24%
Last modified
CVE-2021-3859 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.. EPSS estimates a 1.24% chance of exploitation in the next 30 days.
Description
A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Jboss Enterprise Application Platform | 7.3 |
| Redhat | Jboss Enterprise Application Platform | 7.4 |
| Redhat | Single Sign-On | 7.4.10 |
| Redhat | Single Sign-On | 7.5.1 |
| Redhat | Undertow | < 2.2.15 |
| Netapp | Cloud Secure Agent | All versions |
| Netapp | Oncommand Insight | All versions |
| Netapp | Oncommand Workflow Automation | All versions |
References
- https://access.redhat.com/security/cve/CVE-2021-3859Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2010378Issue Tracking, Vendor Advisory
- https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2Patch, Third Party Advisory
- https://github.com/undertow-io/undertow/pull/1296Third Party Advisory
- https://issues.redhat.com/browse/UNDERTOW-1979Issue Tracking, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20221201-0004/Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3859Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2010378Issue Tracking, Vendor Advisory
- https://github.com/undertow-io/undertow/commit/e43f0ada3f4da6e8579e0020cec3cb1a81e487c2Patch, Third Party Advisory
- https://github.com/undertow-io/undertow/pull/1296Third Party Advisory
- https://issues.redhat.com/browse/UNDERTOW-1979Issue Tracking, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20221201-0004/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3859?
A flaw was found in Undertow that tripped the client-side invocation timeout with certain calls made over HTTP2. This flaw allows an attacker to carry out denial of service attacks.
How severe is CVE-2021-3859?
CVE-2021-3859 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.24% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3859?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3859?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST