CVE-2020-1938When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat.
Updated under an hour ago ()
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It affects Apache Tomcat and 20 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Mar 3, 2022; federal agencies had to remediate by Mar 17, 2022. Treat that date as your deadline.
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When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.
- CVSS
- 9.8 CRITICAL (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Added to CISA KEV Mar 3, 2022; federal remediation due Mar 17, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 99.27% (percentile 100)
- Assigned by
- apache
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Apache Tomcat apache:tomcat (from the name) | Apache Tomcat 9.0.0.M1 to 9.0.0.30; 8.5.0 to 8.5.50; 7.0.0 to 7.0.99 | CNA record |
apache geode apache:geode | 1.12.0 | NVD |
apache tomcat apache:tomcat | from 7.0.0 before 7.0.100; from 8.5.0 before 8.5.51; from 9.0.0 before 9.0.31 | NVD |
fedoraproject fedora fedoraproject:fedora | 30; 31; 32 | NVD |
oracle agile_engineering_data_management oracle:agile_engineering_data_management | 6.2.1.0 | NVD |
oracle agile_product_lifecycle_management oracle:agile_product_lifecycle_management | 9.3.3; 9.3.5; 9.3.6 | NVD |
oracle communications_element_manager oracle:communications_element_manager | 8.1.1; 8.2.0; 8.2.1 | NVD |
oracle communications_instant_messaging_server oracle:communications_instant_messaging_server | 10.0.1.4.0 | NVD |
oracle health_sciences_empirica_inspections oracle:health_sciences_empirica_inspections | 1.0.1.2 | NVD |
oracle health_sciences_empirica_signal oracle:health_sciences_empirica_signal | 7.3.3 | NVD |
oracle hospitality_guest_access oracle:hospitality_guest_access | 4.2.0; 4.2.1 | NVD |
oracle instantis_enterprisetrack oracle:instantis_enterprisetrack | from 17.1 through 17.3 | NVD |
oracle mysql_enterprise_monitor oracle:mysql_enterprise_monitor | through 4.0.12; from 8.0.0 through 8.0.20 | NVD |
oracle siebel_ui_framework oracle:siebel_ui_framework | through 20.5 | NVD |
oracle transportation_management oracle:transportation_management | 6.3.7 | NVD |
oracle workload_manager oracle:workload_manager | 12.2.0.1; 18c; 19c | NVD |
debian debian_linux debian:debian_linux | 8.0; 9.0; 10.0 | NVD |
opensuse leap opensuse:leap | 15.1 | NVD |
blackberry good_control blackberry:good_control | through 5.2.58.38 | NVD |
blackberry workspaces_server blackberry:workspaces_server | 7.0.1; 7.1.2; 8.1.0; 9.0 | NVD |
netapp data_availability_services netapp:data_availability_services | all versions | NVD |
netapp oncommand_system_manager netapp:oncommand_system_manager | from 3.0.0 through 3.1.3 | NVD |
References
- https://lists.apache.org/thread.html/r7c6f492fbd39af34a68681dbbba0468490ff1a97a1bd79c6a53610ef%40%3Cannounce.tomcat.apache.org%3Emailing-list, x-refsource-mlist, vendor-advisory
- https://lists.apache.org/thread.html/r856cdd87eda7af40b50278d6de80ee4b42d63adeb433a34a7bdaf9db%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r75113652e46c4dee687236510649acfb70d2c63e074152049c3f399d%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rd0774c95699d5aeb5e16e9a600fb2ea296e81175e30a62094e27e3e7%40%3Ccommits.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r74328b178f9f37fe759dffbc9c1f2793e66d79d7a8a20d3836551794%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rce2af55f6e144ffcdc025f997eddceb315dfbc0b230e3d750a7f7425%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rad36ec6a1ffc9e43266b030c22ceeea569243555d34fb4187ff08522%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rb2fc890bef23cbc7f343900005fe1edd3b091cf18dada455580258f9%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r38a5b7943b9a62ecb853acc22ef08ff586a7b3c66e08f949f0396ab1%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r17aaa3a05b5b7fe9075613dd0c681efa60a4f8c8fbad152c61371b6e%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rd50baccd1bbb96c2327d5a8caa25a49692b3d68d96915bd1cfbb9f8b%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r4afa11e0464408e68f0e9560e90b185749363a66398b1491254f7864%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist, issue-tracking
- https://lists.apache.org/thread.html/r772335e6851ad33ddb076218fa4ff70de1bf398d5b43e2ddf0130e5d%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist, issue-tracking
- https://lists.debian.org/debian-lts-announce/2020/03/msg00006.htmlmailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/re5eecbe5bf967439bafeeaa85987b3a43f0e6efe06b6976ee768cde2%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r5e2f1201b92ee05a0527cfc076a81ea0c270be299b87895c0ddbe02b%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r549b43509e387a42656f0641fa311bf27c127c244fe02007d5b8d6f6%40%3Cdev.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r61f280a76902b594692f0b24a1dbf647bb5a4c197b9395e9a6796e7c%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r4f86cb260196e5cfcbbe782822c225ddcc70f54560f14a8f11c6926f%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r9f119d9ce9239114022e13dbfe385b3de7c972f24f05d6dbd35c1a2f%40%3Cusers.tomcat.apache.org%3Emailing-list, x-refsource-mlist, patch
- https://lists.apache.org/thread.html/r089dc67c0358a1556dd279c762c74f32d7a254a54836b7ee2d839d8e%40%3Cdev.tomee.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rbdb1d2b651a3728f0ceba9e0853575b6f90296a94a71836a15f7364a%40%3Cdev.tomee.apache.org%3Emailing-list, x-refsource-mlist
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.htmlvendor-advisory, x-refsource-suse, third-party-advisory
- https://lists.apache.org/thread.html/rc068e824654c4b8bd4f2490bec869e29edbfcd5dfe02d47cbf7433b2%40%3Cdev.tomee.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/rf26663f42e7f1a1d1cac732469fb5e92c89908a48b61ec546dbb79ca%40%3Cbugs.httpd.apache.org%3Emailing-list, x-refsource-mlist
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00002.htmlmailing-list, third-party-advisory
- http://support.blackberry.com/kb/articleDetail?articleNumber=000062739third-party-advisory
- https://lists.apache.org/thread.html/r1125f3044a0946d1e7e6f125a6170b58d413ebd4a95157e4608041c7%40%3Cannounce.apache.org%3Emailing-list
- https://lists.apache.org/thread.html/r43faacf64570b1d9a4bada407a5af3b2738b0c007b905f1b6b608c65%40%3Cusers.tomcat.apache.org%3Emailing-list
- https://lists.apache.org/thread.html/r47caef01f663106c2bb81d116b8380d62beac9e543dd3f3bc2c2beda%40%3Ccommits.tomee.apache.org%3Emailing-list
- https://lists.apache.org/thread.html/r57f5e4ced436ace518a9e222fabe27fb785f09f5bf974814cc48ca97%40%3Ccommits.tomee.apache.org%3Emailing-list
- https://lists.apache.org/thread.html/r6a5633cad1b560a1e51f5b425f02918bdf30e090fdf18c5f7c2617eb%40%3Ccommits.tomee.apache.org%3Emailing-list
- https://lists.apache.org/thread.html/r8f7484589454638af527182ae55ef5b628ba00c05c5b11887c922fb1%40%3Cnotifications.ofbiz.apache.org%3Emailing-list, vendor-advisory
- https://lists.apache.org/thread.html/r90890afea72a9571d666820b2fe5942a0a5f86be406fa31da3dd0922%40%3Cannounce.apache.org%3Emailing-list, vendor-advisory
- https://lists.apache.org/thread.html/r92d78655c068d0bc991d1edbdfb24f9c5134603e647cade1113d4e0a%40%3Cusers.tomee.apache.org%3Emailing-list
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.