CVE-2021-3690
CVSS v3
7.5
HIGH
EPSS Score
1.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2022-08-23
Frequently asked questions
What is CVE-2021-3690?
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.
Is CVE-2021-3690 actively exploited?
Active exploitation of CVE-2021-3690 has not been confirmed. Its EPSS score was 1.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-3690?
CVE-2021-3690 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-3690 affecting your environment?
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