Staging Environment: Content and features may be unstable or change without notice.
Advisory details: gitlab / maven/org.apache.tomcat/tomcat/CVE-2021-30639
Advisory ID gitlab/maven/org.apache.tomcat/tomcat/CVE-2021-30639
Aliases CVE-2021-30639
GHSA-44qp-qhfv-c7f6
Summary Improper Handling of Exceptional Conditions A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag associated with the Request object was not reset between requests. This meant that once a non-blocking I/O error occurred, all future requests handled by that request object would fail. Users were able to trigger non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64.
Status Published
Exploitability 0.5
Weighted Severity 0.0
Risk
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (3)
CWE-755 Improper Handling of Exceptional Conditions
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv2 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat/tomcat/CVE-2021-30639.yml
cvssv3.1 https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat/tomcat/CVE-2021-30639.yml
Reference id Reference type URL
https://lists.apache.org/thread.html/r79a7c019712b39aedf7cf4da9276d80610f04441b2a4f6506cb2daaf@%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r79a7c019712b39aedf7cf4da9276d80610f04441b2a4f6506cb2daaf@%3Cusers.tomcat.apache.org%3E
https://lists.apache.org/thread.html/rd84fae1f474597bdf358f5bdc0a5c453c507bd527b83e8be6b5ea3f4%40%3Cannounce.tomcat.apache.org%3E
https://security.netapp.com/advisory/ntap-20210827-0007/
cpujan2022.html Other https://www.oracle.com/security-alerts/cpujan2022.html
CVE-2021-30639 https://nvd.nist.gov/vuln/detail/CVE-2021-30639
GHSA-44qp-qhfv-c7f6 https://github.com/advisories/GHSA-44qp-qhfv-c7f6
index?page=content&id=SB10366 Other https://kc.mcafee.com/corporate/index?page=content&id=SB10366
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat/tomcat/CVE-2021-30639.yml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.apache.tomcat/tomcat/CVE-2021-30639.yml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.