CVE-2020-17527

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

24.62% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.7% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-12-03 18:30Z5 YR AGO

Last updated

2025-02-13 16:27Z1 YR AGO

Reserved

2020-08-12

Assigning CNA

apache

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass

Data version

5.1

Document digest

0ab0e3432f7da62d4a161163104049b2754614274c4c546f7448f756a8b96f72

• lists.apache.orghttps://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5%40%3Cannounce.tomcat.apache.org%3Ex_refsource_MISC
• lists.apache.org[tomcat-dev] 20201203 [SECURITY] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttps://lists.apache.org/thread.html/r8a227ac6a755a6406c1cc47dd48800e973d4cf13fe7fe68ac59c679c%40%3Cdev.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomcat-dev] 20201203 svn commit: r1884073 - in /tomcat/site/trunk: docs/security-10.html docs/security-8.html docs/security-9.html xdocs/security-10.xml xdocs/security-8.xml xdocs/security-9.xmlhttps://lists.apache.org/thread.html/raa0e9ad388c1e6fd1e301b5e080f9439f64cb4178119a86a4801cc53%40%3Cdev.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[announce] 20201203 [SECURITY] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttps://lists.apache.org/thread.html/rce5ac9a40173651d540babce59f6f3825f12c6d4e886ba00823b11e5%40%3Cannounce.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomcat-users] 20201203 [SECURITY] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttps://lists.apache.org/thread.html/rd5babd13d7a350b369b2f647b4dd32ce678af42f9aba5389df1ae6ca%40%3Cusers.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20201203 [SECURITY] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttp://www.openwall.com/lists/oss-security/2020/12/03/3mailing-listx_refsource_MLIST
• lists.apache.org[guacamole-issues] 20201206 [jira] [Created] (GUACAMOLE-1229) Fix in Dockerhub for latest CVE-2020-17527https://lists.apache.org/thread.html/rabbe6b3ae6a9795641d7a05c00d2378d5bbbe4240b7e20f09b092cce%40%3Cissues.guacamole.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[guacamole-issues] 20201206 [jira] [Commented] (GUACAMOLE-1229) Fix in Dockerhub for latest CVE-2020-17527https://lists.apache.org/thread.html/ra35c8d617b17d59f400112cebadec43ad379f98198b4a9726190d7ee%40%3Cissues.guacamole.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomee-commits] 20201207 [jira] [Created] (TOMEE-2936) TomEE plus(7.0.9) is affected by CVE-2020-17527(BDSA-2020-3628) vulnerability.https://lists.apache.org/thread.html/r9fd47f1b03e9b41d16a5cf72659b533887267d3398d963c2fff3abfa%40%3Ccommits.tomee.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomee-commits] 20201207 [jira] [Assigned] (TOMEE-2936) TomEE plus(7.0.9) is affected by CVE-2020-17527(BDSA-2020-3628) vulnerability.https://lists.apache.org/thread.html/r26a2a66339087fc37db3caf201e446d3e83b5cce314371e235ff1784%40%3Ccommits.tomee.apache.org%3Emailing-listx_refsource_MLIST
• lists.debian.org[debian-lts-announce] 20201216 [SECURITY] [DLA 2495-1] tomcat8 security updatehttps://lists.debian.org/debian-lts-announce/2020/12/msg00022.htmlmailing-listx_refsource_MLIST
• security.gentoo.orgGLSA-202012-23https://security.gentoo.org/glsa/202012-23vendor-advisoryx_refsource_GENTOO
• lists.apache.org[tomcat-dev] 20210114 svn commit: r1885488 - in /tomcat/site/trunk: docs/security-10.html docs/security-7.html docs/security-8.html docs/security-9.html xdocs/security-10.xml xdocs/security-7.xml xdocs/security-8.xml xdocs/security-9.xmlhttps://lists.apache.org/thread.html/rca833c6d42b7b9ce1563488c0929f29fcc95947d86e5e740258c8937%40%3Cdev.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[announce] 20210119 Re: [SECURITY][CORRECTION] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttps://lists.apache.org/thread.html/ra9fcdb904dd2e2256ef90b3e4ced279cd464cb0ab63a6c64df5c010d%40%3Cannounce.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomcat-dev] 20210119 Re: [SECURITY][CORRECTION] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttps://lists.apache.org/thread.html/r5a285242737ddef4d338236328aaaf3237183e1465a5efafd16b99ed%40%3Cdev.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomcat-announce] 20210119 Re: [SECURITY][CORRECTION] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttps://lists.apache.org/thread.html/ra9fcdb904dd2e2256ef90b3e4ced279cd464cb0ab63a6c64df5c010d%40%3Cannounce.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[tomcat-users] 20210119 Re: [SECURITY][CORRECTION] CVE-2020-17527 Apache Tomcat HTTP/2 Request header mix-uphttps://lists.apache.org/thread.html/rbba08c4dcef3603e36276d49adda8eedbe458c5104314b4038f697e1%40%3Cusers.tomcat.apache.org%3Emailing-listx_refsource_MLIST
• www.debian.orgDSA-4835https://www.debian.org/security/2021/dsa-4835vendor-advisoryx_refsource_DEBIAN
• lists.apache.org[tomee-commits] 20210319 [jira] [Updated] (TOMEE-2936) TomEE plus(7.0.9) is affected by CVE-2020-17527(BDSA-2020-3628) vulnerability.https://lists.apache.org/thread.html/r2d6e05c5ff96f8068a59dfdb3800e9ee8d4e36ce1971783c6e5f9b20%40%3Ccommits.tomee.apache.org%3Emailing-listx_refsource_MLIST
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• security.netapp.comhttps://security.netapp.com/advisory/ntap-20201210-0003/x_refsource_CONFIRM
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