7.5

CVE-2020-11996: apache apache tomcat

Modified
AliasesSUSE-SU-2020:1841-1SUSE-SU-2020:1962-1SUSE-SU-2020:1963-1
Published 26-06-2020Last modified 08-10-2026

Vulnerability summary

CVE-2020-11996 is a high (CVSS 7.5) vulnerability in apache apache tomcat. EPSS estimates a 26.70% chance of exploitation in the next 30 days, higher than 98% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 27% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
26.70%
0%100%
High · 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 6 · Related 3
DLA-2279-1DSA-4727-1MGASA-2020-0331OPENSUSE-SU-2024:11468-1OPENSUSE-SU-2024:13441-1USN-4596-1

Timeline

  1. 26-06-2020
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

26.70%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

No change 0.00 pp

From 26.70% 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

No weakness data has been published for this record.

Affected systems

Version check

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

Redhat15 products
  • jws5-jboss-logging< 0:3.4.1-1.Final_redhat_00001.1.el6jws | < 0:3.4.1-1.Final_redhat_00001.1.el7jws | < 0:3.4.1-1.Final_redhat_00001.1.el8jws
  • jws5-mod_cluster< 0:1.4.2-7.Final_redhat_00002.2.el6jws | < 0:1.4.2-7.Final_redhat_00002.2.el7jws | < 0:1.4.2-7.Final_redhat_00002.2.el8jws
  • jws5-mod_cluster-tomcat< 0:1.4.2-7.Final_redhat_00002.2.el6jws | < 0:1.4.2-7.Final_redhat_00002.2.el7jws | < 0:1.4.2-7.Final_redhat_00002.2.el8jws
  • jws5-tomcat< 0:9.0.36-6.redhat_5.2.el6jws | < 0:9.0.36-6.redhat_5.2.el7jws | < 0:9.0.36-6.redhat_5.2.el8jws
  • jws5-tomcat-admin-webapps< 0:9.0.36-6.redhat_5.2.el6jws | < 0:9.0.36-6.redhat_5.2.el7jws | < 0:9.0.36-6.redhat_5.2.el8jws
Suse12 products
  • tomcat&distro=SUSE Linux Enterprise High Performance Computing 15-ESPOS< 9.0.36-3.60.1
  • tomcat&distro=SUSE Linux Enterprise High Performance Computing 15-LTSS< 9.0.36-3.60.1
  • tomcat&distro=SUSE Linux Enterprise Module for Web and Scripting 15 SP1< 9.0.36-4.38.1
  • tomcat&distro=SUSE Linux Enterprise Module for Web and Scripting 15 SP2< 9.0.36-3.3.1
  • tomcat&distro=SUSE Linux Enterprise Server 12 SP4-LTSS< 9.0.36-3.42.2
Opensuse3 products
  • leapEOL15.1 | 15.2
  • tomcat&distro=openSUSE Leap 15.1< 9.0.36-lp151.3.24.1
  • tomcat&distro=openSUSE Leap 15.2< 9.0.36-lp152.2.3.1
Oracle3 products
Apache2 products
  • apache tomcat10.0.0-M1 to 10.0.0-M5 | 9.0.0.M1 to 9.0.35 | 8.5.0 to 8.5.55
  • tomcatEOL≥ 8.5.0, ≤ 8.5.55 | ≥ 9.0.0, ≤ 9.0.35 | 9.0.0:milestone1 | 9.0.0:milestone10 | 9.0.0:milestone11 | 9.0.0:milestone12 | 9.0.0:milestone13 | 9.0.0:milestone14 | 9.0.0:milestone15 | 9.0.0:milestone16 | 9.0.0:milestone17 | 9.0.0:milestone18 | 9.0.0:milestone19 | 9.0.0:milestone2 | 9.0.0:milestone20 | 9.0.0:milestone21 | 9.0.0:milestone22 | 9.0.0:milestone23 | 9.0.0:milestone24 | 9.0.0:milestone25 | 9.0.0:milestone26 | 9.0.0:milestone27 | 9.0.0:milestone3 | 9.0.0:milestone4 | 9.0.0:milestone5 | 9.0.0:milestone6 | 9.0.0:milestone7 | 9.0.0:milestone8 | 9.0.0:milestone9 | 10.0.0:milestone1 | 10.0.0:milestone2 | 10.0.0:milestone3 | 10.0.0:milestone4 | 10.0.0:milestone5
Debian2 products
Ubuntu2 products
  • tomcat8All versions (No fix recorded)
  • tomcat9All versions (No fix recorded) | < 9.0.31-1ubuntu0.1
Canonical1 product
Netapp1 product
Org.apache.tomcat1 product
  • tomcat≥ 10.0.0-M1, < 10.0.0-M5 | ≥ 9.0.0.M1, < 9.0.35 | ≥ 8.5.0, < 8.5.55
Org.apache.tomcat.embed1 product
  • tomcat-embed-core≥ 10.0.0-M1, < 10.0.0-M5 | ≥ 9.0.0.M1, < 9.0.35 | ≥ 8.5.0, < 8.5.55

11 vendors · 43 products

References

73 links
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