CVE-2020-17527
HIGHCVSS 7.5/10EPSS 24.62%
Last modified
CVE-2020-17527 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.. EPSS estimates a 24.62% chance of exploitation in the next 30 days.
Description
While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Apache | Tomcat | >= 8.5.1, <= 8.5.59 | — |
| Apache | Tomcat | >= 9.0.1, <= 9.0.35 | — |
| Apache | Tomcat | 9.0.0 | Milestone10 |
| Apache | Tomcat | 9.0.35-3.39.1 | — |
| Apache | Tomcat | 9.0.35-3.57.3 | — |
| Apache | Tomcat | 9.0.36 | — |
| Apache | Tomcat | 9.0.37 | — |
| Apache | Tomcat | 9.0.38 | — |
| Apache | Tomcat | 9.0.39 | — |
| Apache | Tomcat | 10.0.0 | Milestone1 |
| Netapp | Element Plug-In | All versions | — |
| Netapp | Oncommand System Manager | >= 3.0.0, <= 3.1.3 | — |
| Debian | Debian Linux | 9.0 | — |
| Debian | Debian Linux | 10.0 | — |
| Oracle | Blockchain Platform | < 21.1.2 | — |
| Oracle | Communications Cloud Native Core Binding Support Function | 1.10.0 | — |
| Oracle | Communications Cloud Native Core Policy | 1.14.0 | — |
| Oracle | Communications Instant Messaging Server | 10.0.1.5.0 | — |
| Oracle | Instantis Enterprisetrack | 17.1 | — |
| Oracle | Instantis Enterprisetrack | 17.2 | — |
| Oracle | Instantis Enterprisetrack | 17.3 | — |
| Oracle | Mysql Enterprise Monitor | < 8.0.23 | — |
| Oracle | Sd-Wan Edge | 9.0 | — |
| Oracle | Workload Manager | 18c | — |
| Oracle | Workload Manager | 19c | — |
References
- https://www.openwall.com/lists/oss-security/2020/12/03/3Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00022.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202012-23Third Party Advisory
- https://security.netapp.com/advisory/ntap-20201210-0003/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4835Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2020/12/03/3Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/12/msg00022.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202012-23Third Party Advisory
- https://security.netapp.com/advisory/ntap-20201210-0003/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4835Third Party Advisory
- https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-17527?
While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.
How severe is CVE-2020-17527?
CVE-2020-17527 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 24.62% probability of exploitation in the next 30 days.
How do I fix CVE-2020-17527?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-17527?
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Scan your code nowSource: NVD / NIST