CVE-2020-13934: apache tomcat
Vulnerability summary
CVE-2020-13934 is a high (CVSS 7.5) vulnerability in apache tomcat. EPSS estimates a 64.12% chance of exploitation in the next 30 days, higher than 99.2% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 64% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 14 · Related 10Timeline
- 14-07-2020PublishedVulnerability first disclosed.
- 08-10-2026Last modifiedVulnerability information updated.
Description
An h2c direct connection to Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M5 to 9.0.36 and 8.5.1 to 8.5.56 did not release the HTTP/1.1 processor after the upgrade to HTTP/2. If a sufficient number of such requests were made, an OutOfMemoryException could occur leading to a denial of service.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · MavenEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
64.12%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 64.12% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-401Missing Release of Memory after Effective LifetimeThe product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.
- CWE-476NULL Pointer DereferenceThe product dereferences a pointer that it expects to be valid but is NULL.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Oracle9 products
- agile_engineering_data_management6.2.1.0
- agile_product_lifecycle_management9.3.3 | 9.3.5 | 9.3.6
- communications_instant_messaging_server10.0.1.5.0
- fmw_platform12.2.1.3.0 | 12.2.1.4.0
- instantis_enterprisetrack17.1 | 17.2 | 17.3
Debian2 products
- tomcat9< 9.0.37-1
- debian_linuxEOL9.0 | 10.0
Org.apache.tomcat2 products
- tomcat≥ 10.0.0-M1, < 10.0.0-M6 | ≥ 9.0.0.M5, < 9.0.36 | ≥ 8.5.1, < 8.5.56
- tomcat-coyote≥ 10.0.0-M1, < 10.0.0-M6 | ≥ 9.0.0.M5, < 9.0.36 | ≥ 8.5.1, < 8.5.56
Ubuntu2 products
- tomcat8All versions (No fix recorded)
- tomcat9All versions (No fix recorded) | < 9.0.31-1ubuntu0.1
Apache1 product
- tomcatEOL≥ 8.5.1, ≤ 8.5.56 | ≥ 9.0.1, ≤ 9.0.36 | 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: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: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 | 10.0.0:milestone6
Canonical1 product
- ubuntu_linuxEOL20.04
Netapp1 product
- oncommand_system_manager≥ 3.0.0, ≤ 3.1.3
Opensuse1 product
- leapEOL15.1 | 15.2
8 vendors · 19 products
References
23 links
- lists.debian.org/debian-lts-announce/2020/07/msg00017.htmlMailing ListX Refsource MLISTWEBThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00084.htmlVendor AdvisoryX Refsource SUSEWEBMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00088.htmlVendor AdvisoryX Refsource SUSEWEBMailing ListThird Party Advisory
Show all 23 references
- github.com/apache/tomcatPACKAGE