Home/CVE/The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60
CVE

CVE-2021-42340

The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60

The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.

HIGH · CVSS 7.5 EPSS 0.04282
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-772Missing Release of Resource after Effective Lifetime
CWE-772Missing Release of Resource after Effective Lifetime
▤

Affected Products & Versions

21
apache tomcat>= 8.5.60 and < 8.5.72
apache tomcat>= 9.0.40 and < 9.0.54
apache tomcat>= 10.0.1 and < 10.0.12
apache tomcatall versions
netapp hciall versions
netapp management services for element softwareall versions
debian linuxall versions
oracle agile engineering data managementall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.apache.tomcat:tomcat HIGH fixed in 10.1.0-M6
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumTomcat WebServer Logs Deleted
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security@apache.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Oct 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

6
rhsaRHSA-2022:5532Important
rhsaRHSA-2022:1179Important
rhsaRHSA-2021:4863Important
rhsaRHBA-2022:8077Important
rhsaRHSA-2021:4861Important
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kc.mcafee.com/corporate/index?page=content&id=SB10379Third Party Advisory
https://lists.apache.org/thread.html/r8097a2d1550aa78e585fc77e602b9046e6d4099d8d132497c5387784%40%3Ccommits.myfaces.apache.org%3E
https://lists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3EMailing ListVendor Advisory
https://security.gentoo.org/glsa/202208-34Third Party Advisory
https://security.netapp.com/advisory/ntap-20211104-0001/Third Party Advisory
https://www.debian.org/security/2021/dsa-5009Third Party Advisory
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