3.7

CVE-2021-43980: Apache Tomcat: Information disclosure

Modified
AliasesSUSE-SU-2022:4009-1UBUNTU-CVE-2021-43980DEBIAN-CVE-2021-43980
Published 28-09-2022Last modified 21-05-2025

Vulnerability summary

CVE-2021-43980 is a low (CVSS 3.7) vulnerability in apache software foundation apache tomcat. EPSS estimates a 2.36% chance of exploitation in the next 30 days, higher than 83.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.7, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
3.7/10
010
Low · v3.1 (CVE.org)
EPSS score
2.36%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 5
DLA-3160-1DSA-5265-1MGASA-2023-0138OPENSUSE-SU-2024:12534-1OPENSUSE-SU-2024:13441-1RHSA-2022:7272

Timeline

  1. 28-09-2022
    PublishedVulnerability first disclosed.
  2. 21-05-2025
    Last modifiedVulnerability information updated.

Description

The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug in Apache Tomcat 10.1.0 to 10.1.0-M12, 10.0.0-M1 to 10.0.18, 9.0.0-M1 to 9.0.60 and 8.5.0 to 8.5.77 that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

2.36%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.36% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian2 products
Suse2 products
  • tomcat&distro=SUSE Linux Enterprise Server 12 SP5< 9.0.36-3.90.1
  • tomcat&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP5< 9.0.36-3.90.1
Ubuntu2 products
  • tomcat8All versions (No fix recorded)
  • tomcat9All versions (No fix recorded)
Apache1 product
  • tomcat≥ 8.5.0, ≤ 8.5.77 | ≥ 9.0.0, ≤ 9.0.60 | ≥ 10.0.0, ≤ 10.0.18 | 10.1.0:milestone1 | 10.1.0:milestone10 | 10.1.0:milestone11 | 10.1.0:milestone12 | 10.1.0:milestone2 | 10.1.0:milestone3 | 10.1.0:milestone4 | 10.1.0:milestone5 | 10.1.0:milestone6 | 10.1.0:milestone7 | 10.1.0:milestone8 | 10.1.0:milestone9
Apache software foundation1 product
  • apache tomcat10.1.0-M1 to 10.1.0-M12 | 10.0.0-M1 to 10.0.18 | 9.0.0-M1 to 9.0.60 | 8.5.0 to 8.5.77
Org.apache.tomcat1 product
  • tomcat≥ 8.5.0, < 8.5.78 | ≥ 9.0.0-M1, < 9.0.62 | ≥ 10.0.0-M1, < 10.0.20 | ≥ 10.1.0-M1, < 10.1.0-M14

6 vendors · 9 products

References

19 links
Show all 19 references