7.5

CVE-2021-30639: apache software foundation apache tomcat

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-30639GHSA-44qp-qhfv-c7f6BIT-tomcat-2021-30639
Published 12-07-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-30639 is a high (CVSS 7.5) vulnerability in apache software foundation apache tomcat. EPSS estimates a 6.89% chance of exploitation in the next 30 days, higher than 94% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
6.89%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-07-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

6.89%

Chance of exploitation in the next 30 days

Percentile

94%

Versus all other CVEs

30-day change

0.00 pp

From 6.89% on 18-09-2026

18-09-202618-10-2026
EPSS score
6.89%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu4 products
  • tomcat6All versions (No fix recorded)
  • tomcat7All versions (No fix recorded)
  • tomcat8All versions (No fix recorded)
  • tomcat9All versions (No fix recorded)
Apache1 product
  • tomcatEOL8.5.64 | 9.0.44 | 10.0.3 | 10.0.4
Apache software foundation1 product
  • apache tomcatApache Tomcat 10 10.0.3 to 10.0.4 | Apache Tomcat 9 9.0.44 | Apache Tomcat 8.5 8.5.64
Mcafee1 product
  • epolicy_orchestrator< 5.10.0 | 5.10.0 | 5.10.0:update_1 | 5.10.0:update_10 | 5.10.0:update_2 | 5.10.0:update_3 | 5.10.0:update_4 | 5.10.0:update_5 | 5.10.0:update_6 | 5.10.0:update_7 | 5.10.0:update_8 | 5.10.0:update_9
Oracle1 product
Org.apache.tomcat1 product
  • tomcat≥ 10.0.3, < 10.0.5 | ≥ 9.0.0, < 9.0.45 | < 8.5.65

6 vendors · 9 products

References

16 links
Show all 16 references