CVE-2020-1935: 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 parsin
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 9.3% (FIRST EPSS); higher than 95.3% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: tomcat9 (Debian:10) 9.0.31-1~deb10u1; tomcat9 (Debian:12) 9.0.31-1; tomcat7 (Debian:8) 7.0.56-3+really7.0.100-1.
- Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to tomcat9 (Debian:10) 9.0.31-1~deb10u1; tomcat9 (Debian:12) 9.0.31-1; tomcat7 (Debian:8) 7.0.56-3+really7.0.100-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- BDU:2020-03567
- GHSA-qxf4-chvg-4r8r
- DLA-2133-1
- DLA-2209-1
- DSA-4673-1
- DSA-4680-1
- openSUSE-SU-2020:0345-1
- openSUSE-SU-2024:11468-1
- RHSA-2020:1520
- RHSA-2020:3303
- RHSA-2020:4847
- RHSA-2020:5020
- RHSA-2021:0882
- RHSA-2021:1030
- RLSA-2020:4847
- SUSE-SU-2020:0598-1
- SUSE-SU-2020:0631-1
- SUSE-SU-2020:0632-1
- SUSE-SU-2020:2611-1
- Published
- Feb 24, 2020
- Updated
- Oct 8, 2026
- EPSS
- 9.3% · 95th percentile
- CWE
- CWE-444
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 19 / 40 · 4.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 3 / 30 · 9.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| apache | tomcat | cpe:2.3:a:apache:tomcat |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
| netapp | data availability services | cpe:2.3:a:netapp:data_availability_services |
| netapp | oncommand system manager | cpe:2.3:a:netapp:oncommand_system_manager |
| oracle | agile engineering data management | cpe:2.3:a:oracle:agile_engineering_data_management |
| oracle | agile product lifecycle management | cpe:2.3:a:oracle:agile_product_lifecycle_management |
| oracle | communications element manager | cpe:2.3:a:oracle:communications_element_manager |
| oracle | communications instant messaging server | cpe:2.3:a:oracle:communications_instant_messaging_server |
| oracle | health sciences empirica inspections | cpe:2.3:a:oracle:health_sciences_empirica_inspections |
| oracle | health sciences empirica signal | cpe:2.3:a:oracle:health_sciences_empirica_signal |
and 8 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache tomcat7.0.0 and later · up to 7.0.99 inclusive
- apache tomcat8.5.0 and later · up to 8.5.50 inclusive
- apache tomcat9.0.0 and later · up to 9.0.30 inclusive
- apache tomcat9.0.0
- canonical ubuntu linux16.04
- debian debian linux10.0
- debian debian linux8.0
- debian debian linux9.0
- netapp data availability servicesall versions
- netapp oncommand system manager3.0.0 and later · up to 3.1.3 inclusive
- opensuse leap15.1
- oracle agile engineering data management6.2.1.0
- oracle agile product lifecycle management9.3.3
- oracle agile product lifecycle management9.3.5
- oracle agile product lifecycle management9.3.6
- oracle communications element manager8.1.1
- oracle communications element manager8.2.0
- oracle communications element manager8.2.1
- oracle communications instant messaging server10.0.1.4.0
- oracle health sciences empirica inspections1.0.1.2
Versions reported by the vendor
Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.
Apache Apache Tomcat
- Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50, 7.0.0 to 7.0.99affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:10 | tomcat9 | before 9.0.31-1~deb10u1 | 9.0.31-1~deb10u1 |
| Debian:12 | tomcat9 | before 9.0.31-1 | 9.0.31-1 |
| Debian:8 | tomcat7 | before 7.0.56-3+really7.0.100-1 | 7.0.56-3+really7.0.100-1 |
| Debian:8 | tomcat8 | before 8.0.14-1+deb8u17 | 8.0.14-1+deb8u17 |
| Debian:9 | tomcat8 | before 8.5.54-0+deb9u1 | 8.5.54-0+deb9u1 |
| Maven | org.apache.tomcat:tomcat | from 8.0.0 · before 8.5.51 | 8.5.51 |
| Maven | org.apache.tomcat:tomcat | from 9.0.0 · before 9.0.31 | 9.0.31 |
| Maven | org.apache.tomcat:tomcat | before 7.0.100 | 7.0.100 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 8.0.0 · before 8.5.51 | 8.5.51 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 9.0.0 · before 9.0.31 | 9.0.31 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | before 7.0.100 | 7.0.100 |
| openSUSE:Leap 15.1 | tomcat | before 9.0.31-lp151.3.12.1 | 9.0.31-lp151.3.12.1 |
| openSUSE:Tumbleweed | tomcat | before 9.0.36-8.4 | 9.0.36-8.4 |
| Red Hat:enterprise_linux:7::client | tomcat | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-admin-webapps | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-docs-webapp | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-el-2.2-api | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-javadoc | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-jsp-2.2-api | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-jsvc | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-lib | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-servlet-3.0-api | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:7::client | tomcat-webapps | before 0:7.0.76-16.el7_9 | 0:7.0.76-16.el7_9 |
| Red Hat:enterprise_linux:8::appstream | apache-commons-collections | before 0:3.2.2-10.module+el8.1.0+3366+6dfb954c | 0:3.2.2-10.module+el8.1.0+3366+6dfb954c |
+96
Same product
apache: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-24813Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUTKEV99Now
- CVE-2016-8735Remote code execution is possible with Apache Tomcat before 6.0.48, 7.x before 7.0.73, 8.x before 8.0.39, 8.5.x before 8.5.7, and 9.x beforeKEV96Now
- CVE-2017-12617When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTTP PUTs enabled (e.g.KEV92Now
Published before and after this one in the same product
- ← EarlierCVE-2019-12418Dec 23, 2019 · When Apache Tomcat 9.0.0.M1 to 9.0.28, 8.5.0 to 8.5.47, 7.0.0 and 7.0.97 is configured with the JMX Remote Lifecycle Listener, a local attac28Monitor
- ← EarlierCVE-2019-17569Feb 24, 2020 · The refactoring present in Apache Tomcat 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99 introduced a regression.22Monitor
- Later →CVE-2020-9484May 20, 2020 · When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able45Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:tomcat7 | 7.0.56-3+really7.0.100-1 · Debian:8 | Package registry (OSV) |
| debian:tomcat8 | 8.0.14-1+deb8u17 · Debian:8 | Package registry (OSV) |
| debian:tomcat9 | 9.0.31-1 · Debian:12 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat | 7.0.100 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat | 8.5.51 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat | 9.0.31 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 7.0.100 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 8.5.51 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 9.0.31 | Package registry (OSV) |
| opensuse:tomcat | 9.0.31-lp151.3.12.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:jws5-tomcat | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-admin-webapps | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-docs-webapp | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-el-3.0-api | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-javadoc | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-jsp-2.3-api | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-lib | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-native | 0:1.2.23-4.redhat_4.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-native-debuginfo | 0:1.2.23-4.redhat_4.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-selinux | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-servlet-4.0-api | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| red hat:jws5-tomcat-webapps | 0:9.0.30-3.redhat_4.1.el6jws · Red Hat:jboss_enterprise_web_server:5.3::el6 | Package registry (OSV) |
| rocky linux:apache-commons-collections | 0:3.2.2-10.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:apache-commons-lang | 0:2.6-21.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:apache-commons-net | 0:3.6-3.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:bea-stax | 0:1.2.0-16.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:glassfish-fastinfoset | 0:1.2.13-9.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:glassfish-jaxb | 0:2.2.11-11.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:glassfish-jaxb-api | 0:2.2.12-8.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
| rocky linux:jackson-annotations | 0:2.10.0-1.module+el8.3.0+53+ea062990 · Rocky Linux:8 | Package registry (OSV) |
+5
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-20-394 · May 29, 2020(Apache, Tomcat için Güvenlik Güncellemeleri Yayınladı)
- TR-20-203 · Apr 7, 2020(Apache, Tomcat için Güvenlik Güncellemeleri Yayınladı)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (18 more)Show less
- lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E
- lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78%40%3Ccommits.tomee.apache.org%3E
- lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743%40%3Ccommits.tomee.apache.org%3E
- lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18%40%3Cusers.tomcat.apache.org%3E
- lists.debian.org/debian-lts-announce/2020/03/msg00006.html
- lists.debian.org/debian-lts-announce/2020/05/msg00026.html
- security.netapp.com/advisory/ntap-20200327-0005/
- usn.ubuntu.com/4448-1/
- www.debian.org/security/2020/dsa-4673
- www.debian.org/security/2020/dsa-4680
- www.oracle.com/security-alerts/cpujan2021.html
- www.oracle.com/security-alerts/cpujul2020.html
- www.oracle.com/security-alerts/cpuoct2020.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.