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CVE-2020-11996

HIGHCVSS 7.5/10EPSS 26.70%

Last modified

CVE-2020-11996 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.. EPSS estimates a 26.70% chance of exploitation in the next 30 days.

Description

A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
26.70%

97.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersionsUpdate
ApacheTomcat>= 8.5.0, <= 8.5.55—
ApacheTomcat>= 9.0.0, <= 9.0.35—
ApacheTomcat9.0.0Milestone1
ApacheTomcat10.0.0Milestone1
CanonicalUbuntu Linux20.04—
OracleMysql Enterprise Monitor<= 8.0.21—
OracleSiebel Ui Framework<= 20.12—
OracleWorkload Manager12.2.0.1—
OracleWorkload Manager18c—
OracleWorkload Manager19c—
OpensuseLeap15.1—
OpensuseLeap15.2—
DebianDebian Linux9.0—
DebianDebian Linux10.0—
NetappOncommand System Manager3.0—
NetappOncommand System Manager3.1.3—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-11996?
A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
How severe is CVE-2020-11996?
CVE-2020-11996 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 26.70% probability of exploitation in the next 30 days.
How do I fix CVE-2020-11996?
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.

Are you affected by CVE-2020-11996?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST