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 able
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 able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.
- Published
- May 20, 2020
- Updated
- Aug 25, 2026
- EPSS
- 55.5% · 99th percentile
- CWE
- CWE-502
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Report tools
Action score
45
Plan
Add it to your regular patch cycle.
- CVSS
- 28 / 40 · 7.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 17 / 30 · 55.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| apache | tomcat | cpe:2.3:a:apache:tomcat |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| 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 cloud native core binding support function | cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function |
| oracle | communications cloud native core policy | cpe:2.3:a:oracle:communications_cloud_native_core_policy |
| oracle | communications diameter signaling router | cpe:2.3:a:oracle:communications_diameter_signaling_router |
| 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 |
and 14 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- apache tomcat8.5.0 and later · before 8.5.63
- apache tomcat9.0.1 and later · before 9.0.43
- apache tomcat7.0.0 and later · before 7.0.108
- apache tomcat10.0.0
- apache tomcat9.0.0
- canonical ubuntu linux16.04
- canonical ubuntu linux20.04
- debian debian linux10.0
- debian debian linux8.0
- debian debian linux9.0
- fedoraproject fedora31
- fedoraproject fedora32
- mcafee epolicy orchestrator5.10.0
- mcafee epolicy orchestrator5.9.0
- mcafee epolicy orchestrator5.9.1
- 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
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.
n/a Apache Tomcat
- Apache Tomcat 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54, 7.0.0 to 7.0.103affected
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~deb10u2 | 9.0.31-1~deb10u2 |
| Debian:12 | tomcat9 | before 9.0.35-1 | 9.0.35-1 |
| Debian:8 | tomcat7 | before 7.0.56-3+really7.0.100-1+deb8u1 | 7.0.56-3+really7.0.100-1+deb8u1 |
| Debian:8 | tomcat8 | before 8.0.14-1+deb8u17 | 8.0.14-1+deb8u17 |
| Debian:9 | tomcat8 | before 8.5.54-0+deb9u2 | 8.5.54-0+deb9u2 |
| Maven | org.apache.tomcat:tomcat-catalina | from 10.0.0-M1 · before 10.0.0-M5 | 10.0.0-M5 |
| Maven | org.apache.tomcat:tomcat-catalina | from 7.0.0 · before 7.0.104 | 7.0.104 |
| Maven | org.apache.tomcat:tomcat-catalina | from 8.0.0 · before 8.5.55 | 8.5.55 |
| Maven | org.apache.tomcat:tomcat-catalina | from 9.0.0 · before 9.0.35 | 9.0.35 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 10.0.0-M1 · before 10.0.0-M5 | 10.0.0-M5 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 7.0.0 · before 7.0.104 | 7.0.104 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 8.0.0 · before 8.5.55 | 8.5.55 |
| Maven | org.apache.tomcat.embed:tomcat-embed-core | from 9.0.0 · before 9.0.35 | 9.0.35 |
| openSUSE:Leap 15.1 | tomcat | before 9.0.35-lp151.3.18.1 | 9.0.35-lp151.3.18.1 |
| Red Hat:enterprise_linux:6::client | tomcat6 | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-admin-webapps | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-docs-webapp | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-el-2.1-api | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-javadoc | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-jsp-2.1-api | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-lib | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-servlet-2.5-api | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:6::client | tomcat6-webapps | before 0:6.0.24-115.el6_10 | 0:6.0.24-115.el6_10 |
| Red Hat:enterprise_linux:7::client | tomcat | before 0:7.0.76-12.el7_8 | 0:7.0.76-12.el7_8 |
+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
- CVE-2017-12615When running Apache Tomcat 7.0.0 to 7.0.79 on Windows with HTTP PUTs enabled (e.g.KEV92Now
- CVE-2026-34486Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptorKEV62This week
- CVE-2019-0232When running on Windows with enableCmdLineArguments enabled, the CGI Servlet in Apache Tomcat 9.0.0.M1 to 9.0.17, 8.5.0 to 8.5.39 and 7.0.0 62This week
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+deb8u1 · Debian:8 | Package registry (OSV) |
| debian:tomcat8 | 8.0.14-1+deb8u17 · Debian:8 | Package registry (OSV) |
| debian:tomcat9 | 9.0.35-1 · Debian:12 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-catalina | 10.0.0-M5 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-catalina | 7.0.104 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-catalina | 8.5.55 | Package registry (OSV) |
| Maven:org.apache.tomcat:tomcat-catalina | 9.0.35 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 10.0.0-M5 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 7.0.104 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 8.5.55 | Package registry (OSV) |
| Maven:org.apache.tomcat.embed:tomcat-embed-core | 9.0.35 | Package registry (OSV) |
| opensuse:tomcat | 9.0.35-lp151.3.18.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:tomcat-native | 0:1.2.23-22.redhat_22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat-native-debuginfo | 0:1.2.23-22.redhat_22.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7 | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-admin-webapps | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-docs-webapp | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-el-2.2-api | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-javadoc | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-jsp-2.2-api | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-jsvc | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-lib | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-log4j | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| red hat:tomcat7-selinux | 0:7.0.70-40.ep7.el6 · Red Hat:jboss_enterprise_web_server:3.1::el6 | Package registry (OSV) |
| suse:tomcat | 9.0.35-4.30.2 · SUSE:Linux Enterprise Module for Web and Scripting 15 SP1 | Package registry (OSV) |
| suse:tomcat6 | 6.0.53-0.57.16.1 · SUSE:Linux Enterprise Point of Sale 11 SP3 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Nuclei detection template ×1
- Proof-of-concept repository on GitHub ×17
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Nuclei detection template | Nuclei template CVE-2020-9484 | — |
| Proof-of-concept repository on GitHub | stars:214 | 2020-05-19 |
| Proof-of-concept repository on GitHub | stars:126 | 2020-05-21 |
| Proof-of-concept repository on GitHub | stars:0 | 2020-05-21 |
| Proof-of-concept repository on GitHub | stars:52 | 2020-05-21 |
| Proof-of-concept repository on GitHub | stars:1 | 2020-06-04 |
| Proof-of-concept repository on GitHub | stars:6 | 2020-09-05 |
| Proof-of-concept repository on GitHub | stars:35 | 2020-12-31 |
| Proof-of-concept repository on GitHub | stars:0 | 2021-01-12 |
| Proof-of-concept repository on GitHub | stars:4 | 2021-01-26 |
| Proof-of-concept repository on GitHub | stars:13 | 2021-02-10 |
| Proof-of-concept repository on GitHub | stars:0 | 2021-03-01 |
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.
- First PoC-2 d
- Published
- TodaySep 30, 2026+2324 d
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).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-502 · Deserialization of Untrusted DataCVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Root cause
Data received over the network is deserialized into the language’s native object format without verifying its source. Code paths inside the object can be triggered during deserialization.
The bug in code
The whole CWE-502 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
payload = sock.recv(65536)job = pickle.loads(payload)Fixed
payload = sock.recv(65536)if not hmac.compare_digest(sign(payload), header_sig): raise PermissionError("invalid signature")job = JobSchema.validate(json.loads(payload))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
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2020-05/msg00057.html
- packetstormsecurity.com/files/157924/Apache-Tomcat-CVE-2020-9484-Proof-Of-Concept.html
- seclists.org/fulldisclosure/2020/Jun/6
- www.openwall.com/lists/oss-security/2021/03/01/2
- kc.mcafee.com/corporate/index?page=content&id=SB10332
- lists.apache.org/thread.html/r11ce01e8a4c7269b88f88212f21830edf73558997ac7744f37769b77%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/r123b3ebe389f46f9d337923f393cdae4d3e9b78d982d706712f0898c%40%3Ccommits.tomee.apache.org%3E
- lists.apache.org/thread.html/r26950738f4b4ca2d256597cf391d52d3450fa665c297ea5ca38f5469%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1%40%3Cannounce.tomcat.apache.org%3E
- lists.apache.org/thread.html/r7bc247fffcb1d58415215c861d2354bd653c86266230d78a93c71ae2%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/r8a2ac0e476dbfc1e6440b09dcc782d444ad635d6da26f0284725a5dc%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/r8dd19c514face6dd85fd4eab0271854883f40c7307926c1f7cd5400c%40%3Ccommits.tomee.apache.org%3E
- lists.apache.org/thread.html/raa4123e472175bb052fbba165d37187cea923f755e8f3f30d124cb3f%40%3Ccommits.tomee.apache.org%3E
- lists.apache.org/thread.html/rb1c0fb105ce2b93b7ec6fc1b77dd208022621a91c12d1f580813cfed%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/rb51ccd58b2152fc75125b2406fc93e04ca9d34e737263faa6ff0f41f%40%3Cusers.tomcat.apache.org%3E
- lists.apache.org/thread.html/rc1778b38e74b5b6142414d57623bd55b023a72361f422836782fca3c%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/rc8473b08abdf3c16494ed817bec1717a0ee0c8080315bc27db5f21c3%40%3Ccommits.tomee.apache.org%3E
- lists.apache.org/thread.html/rf59c72572b9fee674a5d5cc6afeca4ffc3918a02c354a81cc50b7119%40%3Ccommits.tomee.apache.org%3E
- lists.apache.org/thread.html/rf6d5d57b114678d8898005faef31e9fd6d7c981fcc4ccfc3bc272fc9%40%3Cdev.tomcat.apache.org%3E
- lists.apache.org/thread.html/rf70f53af27e04869bdac18b1fc14a3ee529e59eb12292c8791a77926%40%3Cusers.tomcat.apache.org%3E
Vendor advisories and official records. Exploit/PoC links are deliberately left out.