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Oracle Critical Patch Update April 2025

Released April 2025 · Oracle's advisory ↗ · ← Critical Patch Update, January 2025 · Critical Patch Update, July 2025 →

255 CVEs in this release, one square each

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Share this chart Oracle Critical Patch Update April 2025, one square per CVE: 118 Java CVEs, 22 protected by Waratek, 11 exploited, 137 other CVEs in this release.

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22Protected by Waratek8Mitigation candidate88No exploit published16Outside Waratek scope121Not applicable 11Exploited, marked by the ring

No exploit published. For 33 of them, Oracle's security advisory is the source of public detail.

Protected by Waratek. Waratek RASP can block exploitation of these on systems that have not applied the patch yet.

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Overview 118 matches · 22 protected · 6 exploited · 3 CISA KEV · 14 public PoC · 8 EPSS ≥ 0.5
118matches 22protected18.6% 6exploited5.1% 3CISA KEV2.5% 14public PoC11.9% 8EPSS ≥ 0.56.8%
Protected by Waratek 22 18.6% Rule in development 0 0.0% Mitigation candidate 8 6.8% No exploit published 88 74.6%
Critical 12 10.2% High 49 41.5% Medium 53 44.9% Low 4 3.4% None 0 0.0% Unknown 0 0.0%
blocked by ARMR today 22 18.6% partly blocked 0 0.0% not blocked 96 81.4% not established 0 0.0% unrecorded 0 0.0%
Exploited 6 5.1% Working exploit published 4 3.4% Proof of concept only 13 11.0% Forecast only 2 1.7% No public exploit 93 78.8%
split by peak 31 / quarter
No exploit published: 88Mitigation candidate: 8Protected by Waratek: 22 Low: 4Medium: 53High: 49Critical: 12 not blocked: 96blocked by ARMR today: 22 No public exploit: 93Forecast only: 2Proof of concept only: 13Working exploit published: 4Exploited: 6
Q1 203 Protected by Waratek2 No exploit published1 Critical2 Medium1 blocked by ARMR today2 not blocked1 Exploited1 Proof of concept only1 No public exploit1 Q2 202 Protected by Waratek1 Mitigation candidate1 High2 blocked by ARMR today1 not blocked1 Working exploit published1 Proof of concept only1 Q3 201 Mitigation candidate1 High1 not blocked1 Working exploit published1 Q4 202 Protected by Waratek1 No exploit published1 High1 Medium1 blocked by ARMR today1 not blocked1 Forecast only1 No public exploit1 Q1 214 Protected by Waratek2 No exploit published2 High3 Medium1 blocked by ARMR today2 not blocked2 No public exploit4 Q2 211 No exploit published1 High1 not blocked1 No public exploit1 Q3 214 No exploit published4 High2 Medium2 not blocked4 Forecast only1 No public exploit3 Q4 211 No exploit published1 Medium1 not blocked1 No public exploit1 Q1 221 No exploit published1 High1 not blocked1 No public exploit1 Q2 221 No exploit published1 High1 not blocked1 No public exploit1 Q3 222 Protected by Waratek1 No exploit published1 Medium1 Low1 blocked by ARMR today1 not blocked1 Proof of concept only1 No public exploit1 Q4 224 Protected by Waratek2 No exploit published2 Critical1 High3 blocked by ARMR today2 not blocked2 Proof of concept only1 No public exploit3 Q1 235 Protected by Waratek2 No exploit published3 High4 Medium1 blocked by ARMR today2 not blocked3 Exploited1 Proof of concept only1 No public exploit3 Q2 231 No exploit published1 Medium1 not blocked1 No public exploit1 Q3 236 Protected by Waratek2 Mitigation candidate1 No exploit published3 Critical1 High1 Medium3 Low1 blocked by ARMR today2 not blocked4 Proof of concept only1 No public exploit5 Q4 235 Mitigation candidate2 No exploit published3 High2 Medium3 not blocked5 Exploited1 Working exploit published1 No public exploit3 Q1 248 Mitigation candidate1 No exploit published7 High5 Medium3 not blocked8 Proof of concept only2 No public exploit6 Q2 243 No exploit published3 High3 not blocked3 No public exploit3 Q3 248 Protected by Waratek2 No exploit published6 Critical1 High6 Medium1 blocked by ARMR today2 not blocked6 Exploited1 Proof of concept only1 No public exploit6 Q4 2419 Protected by Waratek5 Mitigation candidate2 No exploit published12 Critical5 High2 Medium11 Low1 blocked by ARMR today5 not blocked14 Exploited1 Working exploit published1 Proof of concept only2 No public exploit15 Q1 256 Protected by Waratek1 No exploit published5 Critical1 High3 Medium2 blocked by ARMR today1 not blocked5 Exploited1 Proof of concept only2 No public exploit3 Q2 2531 Protected by Waratek1 No exploit published30 Critical1 High8 Medium21 Low1 blocked by ARMR today1 not blocked30 No public exploit31
Q2 20Q4 20Q2 21Q4 21Q2 22Q4 22Q2 23Q4 23Q2 24Q4 24Q2 25
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CVE Severity Published▾ Status Exploitation Description
CVE-2021-41973 Medium 2021-11-01 No exploit published No public exploit In Apache MINA, a specifically crafted, malformed HTTP request may cause the HTTP Header decoder to loop indefinitely. The decoder assumed that the HTTP Header begins at the beginning of the buffer and loops if there is more data than expected. Please update MINA to 2.1.5 or greater.
CVE-2021-41079 High 2021-09-16 No exploit published No public exploit Apache Tomcat 8.5.0 to 8.5.63, 9.0.0-M1 to 9.0.43 and 10.0.0-M1 to 10.0.2 did not properly validate incoming TLS packets. When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a specially crafted packet could be used to trigger an infinite loop resulting in a denial of service.
CVE-2021-37714 High 2021-08-18 No exploit published No public exploit jsoup is a Java library for working with HTML. Those using jsoup versions prior to 1.14.2 to parse untrusted HTML or XML may be vulnerable to DOS attacks. If the parser is run on user supplied input, an attacker may supply content that causes the parser to get stuck (loop indefinitely until cancelled), to complete more slowly than usual, or to throw an unexpected exception. This effect may support a denial of service attack. The issue is patched in version 1.14.2. There are a few available workarounds. Users may rate limit input parsing, limit the size of inputs based on system resources, and/or implement thread watchdogs to cap and timeout parse runtimes.
CVE-2021-33037 Medium 2021-07-12 No exploit published Forecast only Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
CVE-2021-30640 Medium 2021-07-12 No exploit published No public exploit A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.
CVE-2021-31684 High 2021-06-01 No exploit published No public exploit A vulnerability was discovered in the indexOf function of JSONParserByteArray in JSON Smart versions 1.3 and 2.4 which causes a denial of service (DOS) via a crafted web request.
CVE-2020-13936 High 2021-03-10 No exploit published No public exploit An attacker that is able to modify Velocity templates may execute arbitrary Java code or run arbitrary system commands with the same privileges as the account running the Servlet container. This applies to applications that allow untrusted users to upload/modify velocity templates running Apache Velocity Engine versions up to 2.2.
CVE-2021-25329 High 2021-03-01 Protected by Waratek No public exploit The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to this issue.
CVE-2021-25122 High 2021-03-01 Protected by Waratek No public exploit When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.
CVE-2021-24122 Medium 2021-01-14 No exploit published No public exploit When serving resources from a network location using the NTFS file system, Apache Tomcat versions 10.0.0-M1 to 10.0.0-M9, 9.0.0.M1 to 9.0.39, 8.5.0 to 8.5.59 and 7.0.0 to 7.0.106 were susceptible to JSP source code disclosure in some configurations. The root cause was the unexpected behaviour of the JRE API File.getCanonicalPath() which in turn was caused by the inconsistent behaviour of the Windows API (FindFirstFileW) in some circumstances.
CVE-2020-25649 High 2020-12-03 Protected by Waratek No public exploit A flaw was found in FasterXML Jackson Databind, where it did not have entity expansion secured properly. This flaw allows vulnerability to XML external entity (XXE) attacks. The highest threat from this vulnerability is data integrity.
CVE-2020-13943 Medium 2020-10-12 No exploit published Forecast only If an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources.
CVE-2020-13935 High 2020-07-14 Mitigation candidate Working exploit published The payload length in a WebSocket frame was not correctly validated in Apache Tomcat 10.0.0-M1 to 10.0.0-M6, 9.0.0.M1 to 9.0.36, 8.5.0 to 8.5.56 and 7.0.27 to 7.0.104. Invalid payload lengths could trigger an infinite loop. Multiple requests with invalid payload lengths could lead to a denial of service.
CVE-2020-11996 High 2020-06-26 Mitigation candidate Proof of concept only A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
CVE-2020-9484 High 2020-05-20 Protected by Waratek Working exploit published 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.
CVE-2020-1938 Critical 2020-02-24 Protected by Waratek Exploited 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.
CVE-2020-1935 Medium 2020-02-24 No exploit published No public exploit 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.
CVE-2016-1000027 Critical 2020-01-02 Protected by Waratek Proof of concept only Pivotal Spring Framework through 5.3.16 suffers from a potential remote code execution (RCE) issue if used for Java deserialization of untrusted data. Depending on how the library is implemented within a product, this issue may or not occur, and authentication may be required. NOTE: the vendor's position is that untrusted data is not an intended use case. The product's behavior will not be changed because some users rely on deserialization of trusted data.
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