`CVE-2020-1935`

4.8 Medium No exploit published

Description

In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

CWE-444

Exploitation Status

No public exploit

Nothing published shows this CVE being exploited, which is not the same as ruling it out. nothing published in 6 years.

CVSS E:U

CISA KEV not listed
CISA Vulnrichment no assessment published
Indexed PoC none indexed
EPSS 9.4% chance in 30 days

Waratek Defense Posture

No exploit published

In RASP's scope with an upstream fix path, but nobody has published a working exploit. That is a statement about what has been published, not a finding that the defect is unreachable or unimportant.

Protection none
Action unverified patch rule
Review automated upstream-data
Record active

Decided by no-exploit-published : A published working exploit for this candidate, not only a proof of concept, a forecast, or nothing at all

Finding This CVE is not listed in CISA KEV, CISA Vulnrichment records no active exploitation, and no reviewed exploit catalogue carries an entry for it. Nobody has published something a stranger can run, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

Decided by	`no-exploit-published` : A published working exploit for this candidate, not only a proof of concept, a forecast, or nothing at all
Finding	This CVE is not listed in CISA KEV, CISA Vulnrichment records no active exploitation, and no reviewed exploit catalogue carries an entry for it. Nobody has published something a stranger can run, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.

CVSS

4.8 MEDIUM v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N 2 metrics

VRT selects the newest version's highest entry and publishes it as cvssScore, newest rather than largest because scores are not comparable across versions, and highest rather than first because the first entry is frequently a CNA placeholder scoring 0.0 over NVD's own analysis.

Version Score Band Vector Assigner Type

CVSS 3.1 4.8 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N NVD Primary published

CVSS 2.0 5.8 no band published AV:N/AC:M/Au:N/C:P/I:P/A:N NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	4.8	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`	NVD	Primary	published
CVSS 2.0	5.8	no band published	`AV:N/AC:M/Au:N/C:P/I:P/A:N`	NVD	Primary

Affected Software & Releases

☕ Maven Library Packages

Artifact coordinates and fix boundaries from OSV.dev

Package Coordinate Introduced Fixed Last affected

org.apache.tomcat.embed:tomcat-embed-core 0 7.0.100 unbounded

org.apache.tomcat.embed:tomcat-embed-core 8.0.0 8.5.51 unbounded

org.apache.tomcat.embed:tomcat-embed-core 9.0.0 9.0.31 unbounded

org.apache.tomcat:tomcat 0 7.0.100 unbounded

org.apache.tomcat:tomcat 8.0.0 8.5.51 unbounded

org.apache.tomcat:tomcat 9.0.0 9.0.31 unbounded

Package Coordinate	Introduced	Fixed	Last affected
`org.apache.tomcat.embed:tomcat-embed-core`	0	`7.0.100`	unbounded
`org.apache.tomcat.embed:tomcat-embed-core`	8.0.0	`8.5.51`	unbounded
`org.apache.tomcat.embed:tomcat-embed-core`	9.0.0	`9.0.31`	unbounded
`org.apache.tomcat:tomcat`	0	`7.0.100`	unbounded
`org.apache.tomcat:tomcat`	8.0.0	`8.5.51`	unbounded
`org.apache.tomcat:tomcat`	9.0.0	`9.0.31`	unbounded

🖥️ Product CPEs & Version Ranges

22 product(s) over 66 version claims (uncapped)

Source	Vendor	Product	Scheme	Affected Versions
nvd	apache	tomcat	generic	≥ 7.0.0 and ≤ 7.0.99 · ≥ 8.5.0 and ≤ 8.5.50 · 9.0.0 · 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 · ≥ 9.0.0 and ≤ 9.0.30
nvd	canonical	ubuntu linux	generic	16.04
nvd	debian	debian linux	generic	8.0 · 9.0 · 10.0
nvd	netapp	data availability services	generic	any version
nvd	netapp	oncommand system manager	generic	≥ 3.0.0 and ≤ 3.1.3
nvd	opensuse	leap	generic	15.1
nvd	oracle	agile engineering data management	generic	6.2.1.0
nvd	oracle	agile product lifecycle management	generic	9.3.3 · 9.3.5 · 9.3.6
nvd	oracle	communications element manager	generic	8.1.1 · 8.2.0 · 8.2.1
nvd	oracle	communications instant messaging server	generic	10.0.1.4.0
nvd	oracle	health sciences empirica inspections	generic	1.0.1.2
nvd	oracle	health sciences empirica signal	generic	7.3.3
nvd	oracle	hospitality guest access	generic	4.2.0 · 4.2.1
nvd	oracle	hyperion infrastructure technology	generic	11.1.2.4
nvd	oracle	instantis enterprisetrack	generic	≥ 17.1 and ≤ 17.3
nvd	oracle	mysql enterprise monitor	generic	≥ 4.0.0 and ≤ 4.0.12 · ≥ 8.0.0 and ≤ 8.0.20
nvd	oracle	retail order broker	generic	15.0
nvd	oracle	siebel ui framework	generic	≤ 20.5
nvd	oracle	transportation management	generic	6.3.7
nvd	oracle	workload manager	generic	12.2.0.1 · 18c · 19c
osv	org.apache.tomcat	tomcat	generic	＜ 7.0.100 · ≥ 8.0.0 and ＜ 8.5.51 · ≥ 9.0.0 and ＜ 9.0.31
osv	org.apache.tomcat.embed	tomcat-embed-core	generic	＜ 7.0.100 · ≥ 8.0.0 and ＜ 8.5.51 · ≥ 9.0.0 and ＜ 9.0.31

Source

Vendor

Product

Scheme

Affected Versions

nvd

apache

tomcat

generic

≥ 7.0.0 and ≤ 7.0.99 · ≥ 8.5.0 and ≤ 8.5.50 · 9.0.0 · 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 · ≥ 9.0.0 and ≤ 9.0.30

nvd

canonical

ubuntu linux

generic

16.04

nvd

debian

debian linux

generic

8.0 · 9.0 · 10.0

nvd

netapp

data availability services

generic

any version

nvd

netapp

oncommand system manager

generic

≥ 3.0.0 and ≤ 3.1.3

nvd

opensuse

leap

generic

15.1

nvd

oracle

agile engineering data management

generic

6.2.1.0

nvd

oracle

agile product lifecycle management

generic

9.3.3 · 9.3.5 · 9.3.6

nvd

oracle

communications element manager

generic

8.1.1 · 8.2.0 · 8.2.1

nvd

oracle

communications instant messaging server

generic

10.0.1.4.0

nvd

oracle

health sciences empirica inspections

generic

1.0.1.2

nvd

oracle

health sciences empirica signal

generic

7.3.3

nvd

oracle

hospitality guest access

generic

4.2.0 · 4.2.1

nvd

oracle

hyperion infrastructure technology

generic

11.1.2.4

nvd

oracle

instantis enterprisetrack

generic

≥ 17.1 and ≤ 17.3

nvd

oracle

mysql enterprise monitor

generic

≥ 4.0.0 and ≤ 4.0.12 · ≥ 8.0.0 and ≤ 8.0.20

nvd

oracle

retail order broker

generic

15.0

nvd

oracle

siebel ui framework

generic

≤ 20.5

nvd

oracle

transportation management

generic

6.3.7

nvd

oracle

workload manager

generic

12.2.0.1 · 18c · 19c

osv

org.apache.tomcat

tomcat

generic

＜ 7.0.100 · ≥ 8.0.0 and ＜ 8.5.51 · ≥ 9.0.0 and ＜ 9.0.31

osv

org.apache.tomcat.embed

tomcat-embed-core

generic

＜ 7.0.100 · ≥ 8.0.0 and ＜ 8.5.51 · ≥ 9.0.0 and ＜ 9.0.31

References

URL	Tags
https://www.oracle.com/security-alerts/cpuoct2020.html	WEB
https://www.oracle.com/security-alerts/cpujul2020.html	WEB
https://www.oracle.com/security-alerts/cpujan2021.html	WEB
https://www.debian.org/security/2020/dsa-4680	WEB
https://www.debian.org/security/2020/dsa-4673	WEB
https://usn.ubuntu.com/4448-1	WEB
https://security.netapp.com/advisory/ntap-20200327-0005	WEB
https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html	WEB
https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html	WEB
https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E	WEB

URL

Timeline

Published 2020-02-24 Last modified 2026-06-17

Published	2020-02-24	By the CVE Program.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2020-02-24

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

Pipeline policy audit (15 of 21 rules evaluated)

15 of 21 rules ran. The rest were never reached, because an earlier stage settled the CVE, a distinct claim from a rule that ran and found nothing.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? first match wins

1 rejected no-match CVE Program withdrawal of this identifier

scope: Is the vulnerability ARMR's to address? first match wins

2 armr-patch-file no-match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no-match An ARMR security-rule template on disk for this CVE

4 manual-classification no-match A researcher's recorded decision for this specific CVE

5 manual classification no-match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no-match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no-match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the native WebLogic proxy plug-in. Oracle gives these no CPE of their own and names them only in the description.

8 osv-maven matched Queued for review Maven packages: org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat

9 cna-maven-package not-reached An affected Maven artifact named by the CNA itself

10 known-cpe-product not-reached An NVD CPE naming a product ARMR tracks

11 cna-cpe-product not-reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

12 oracle-advisory-family not-reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

13 non-deployable-product not-reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

14 unmatched-product not-reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? cumulative: every rule gets a turn

15 patch-hint no-match A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

16 open-source-maven matched Mitigation candidate Open-source Maven artifact indexed by OSV (Maven packages: org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat). The source is public, which makes an ARMR patch rule a candidate; nothing here establishes that one can be written.

17 poc-derivable skipped An indexed exploit to reverse-engineer, where there is no source to read

18 no-exploit skipped With no fix path, a public exploit, or a CISA record of one

19 secure-rule-match no-match A vulnerability class already blocked by an ARMR security rule

20 below-action-threshold withheld CVE ships in an Oracle advisory — Oracle treats it as urgent, so severity does not settle it

21 no-exploit-published decided it matched No exploit published No working exploit has been published, and an upstream fix path does exist, so the remediation half of the candidacy still holds.

What the scope rules read

The products the record named, and whether known-products.yaml tracks them. This is the evidence the scope stage decided on.

Vendor Product Tracked CPE Source

apache tomcat tracked cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* yaml

debian debian_linux not tracked cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

canonical ubuntu_linux not tracked cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

opensuse leap not tracked cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*

netapp data_availability_services not tracked cpe:2.3:a:netapp:data_availability_services:-:*:*:*:*:*:*:*

netapp oncommand_system_manager not tracked cpe:2.3:a:netapp:oncommand_system_manager:*:*:*:*:*:*:*:*

oracle agile_engineering_data_management tracked cpe:2.3:a:oracle:agile_engineering_data_management:6.2.1.0:*:*:*:*:*:*:* yaml

oracle agile_product_lifecycle_management tracked cpe:2.3:a:oracle:agile_product_lifecycle_management:9.3.3:*:*:*:*:*:*:* yaml

oracle communications_element_manager tracked cpe:2.3:a:oracle:communications_element_manager:8.1.1:*:*:*:*:*:*:* yaml

oracle communications_instant_messaging_server tracked cpe:2.3:a:oracle:communications_instant_messaging_server:10.0.1.4.0:*:*:*:*:*:*:* yaml

oracle health_sciences_empirica_inspections tracked cpe:2.3:a:oracle:health_sciences_empirica_inspections:1.0.1.2:*:*:*:*:*:*:* yaml

oracle health_sciences_empirica_signal tracked cpe:2.3:a:oracle:health_sciences_empirica_signal:7.3.3:*:*:*:*:*:*:* yaml

oracle hospitality_guest_access tracked cpe:2.3:a:oracle:hospitality_guest_access:4.2.0:*:*:*:*:*:*:* yaml

oracle hyperion_infrastructure_technology tracked cpe:2.3:a:oracle:hyperion_infrastructure_technology:11.1.2.4:*:*:*:*:*:*:* yaml

oracle instantis_enterprisetrack tracked cpe:2.3:a:oracle:instantis_enterprisetrack:*:*:*:*:*:*:*:* yaml

oracle mysql_enterprise_monitor tracked cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:* yaml

oracle retail_order_broker tracked cpe:2.3:a:oracle:retail_order_broker:15.0:*:*:*:*:*:*:* yaml

oracle siebel_ui_framework tracked cpe:2.3:a:oracle:siebel_ui_framework:*:*:*:*:*:*:*:* yaml

oracle transportation_management tracked cpe:2.3:a:oracle:transportation_management:6.3.7:*:*:*:*:*:*:* yaml

oracle workload_manager not tracked cpe:2.3:a:oracle:workload_manager:12.2.0.1:*:*:*:*:*:*:*

Raw stored JSON document for this CVE ↗ · NVD ↗ · CVE.org ↗