CVE-2021-3690: redhat fuse Uncontrolled Resource Consumption
Vulnerability summary
CVE-2021-3690 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in redhat fuse. EPSS estimates a 1.77% chance of exploitation in the next 30 days, higher than 78.2% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6Timeline
- 23-08-2022PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · Red hatEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · MavenEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.77%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
Increase +0.10 pp
From 1.68% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (issues.redhat.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
- CWE-401Missing Release of Memory after Effective LifetimeThe product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat8 products
- fuse1.0
- integration_camel_kna
- integration_camel_quarkusna
- jboss_enterprise_application_platformna | 7.3 | 7.4
- openshift_application_runtimesna
Debian1 product
- undertow< 2.2.10-1
Io.undertow1 product
- undertow-core< 2.0.40 | ≥ 2.2.0, < 2.2.10
Ubuntu1 product
- undertowAll versions (No fix recorded)
4 vendors · 11 products
References
20 links- issues.redhat.com/browse/UNDERTOW-1935X Refsource MISCREPORTWEBExploitIssue TrackingMitigationVendor Advisory
- github.com/undertow-io/undertow/commit/c7e84a0b7efced38506d7d1dfea5902366973877X Refsource MISCWEBPatchThird Party Advisory
