CVE-2019-17563

When using FORM authentication with Apache Tomcat 9.0.0.M1 to 9.0.29, 8.5.0 to 8.5.49 and 7.0.0 to 7.0.98 there was a narrow window where an attacker could perform a session fixation attack. The window was considered too narrow for an exploit to be practical but, erring on the side of caution, this issue has been treated as a security vulnerability.

Published: 2019-12-23 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-17563 is rated High Risk (68.3/100): CVSS High severity, with high exploitation likelihood (EPSS 10.69%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +6.33% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-17563

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 4.36% 10.69% +6.33%
2 2026-05-29 3.26% 4.36% +1.10%
3 2026-05-26 — 3.26% —

Full EPSS history (54 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-17563

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.6 5.9 [email protected]
5.1 2.0 MEDIUM
AV:N/AC:H/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 4.9 6.4 [email protected]

Weakness enumeration for CVE-2019-17563

GitHub Security Advisory for CVE-2019-17563

GHSA-9xcj-c8cr-8c3c · Severity: high · Ecosystem: maven — In Apache Tomcat, when using FORM authentication there was a narrow window where an attacker could perform a session fixation attack

OS Trackers for CVE-2019-17563

vendor priority summary link
debian not yet assigned CVE-2019-17563 not yet assigned priority: Debian including 1 source packages (tomcat9), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-17563
gentoo normal CVE-2019-17563: 1 GLSA(s) (202003-43), 1 atom(s) (www-servers/tomcat); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-17563
redhat low — https://access.redhat.com/security/cve/CVE-2019-17563
suse low CVE-2019-17563 severity low: SUSE including 344 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 513 product×package rows across 29 product lines (HPE Helion OpenStack 8, SUSE Enterprise Storage 5, … (29 product lines)): Fixed 268, Known Affected 231, Known Not Affected 14. https://www.suse.com/security/cve/CVE-2019-17563/
ubuntu low CVE-2019-17563 low priority: Ubuntu including 3 source packages (tomcat7, tomcat8, tomcat9), 54 status rows across 18 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 31, not-affected 12, needed 5, released 4, ignored 2. https://ubuntu.com/security/CVE-2019-17563

Affected software / configurations for CVE-2019-17563

Vendor Product Version Raw CPE
apache tomcat >= 7.0.0, <= 7.0.98 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 8.5.0, <= 8.5.49 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
apache tomcat >= 9.0.0, <= 9.0.29 cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
oracle agile_engineering_data_management 6.2.1.0 cpe:2.3:a:oracle:agile_engineering_data_management:6.2.1.0:*:*:*:*:*:*:*
oracle hyperion_infrastructure_technology 11.1.2.4 cpe:2.3:a:oracle:hyperion_infrastructure_technology:11.1.2.4:*:*:*:*:*:*:*
oracle instantis_enterprisetrack >= 17.1, <= 17.3 cpe:2.3:a:oracle:instantis_enterprisetrack:*:*:*:*:*:*:*:*
oracle micros_relate_crm_software 11.4 cpe:2.3:a:oracle:micros_relate_crm_software:11.4:*:*:*:*:*:*:*
oracle mysql_enterprise_monitor <= 4.0.11.5331 cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:*
oracle mysql_enterprise_monitor >= 8.0.0, <= 8.0.18.1217 cpe:2.3:a:oracle:mysql_enterprise_monitor:*:*:*:*:*:*:*:*
oracle retail_order_broker 15.0 cpe:2.3:a:oracle:retail_order_broker:15.0:*:*:*:*:*:*:*
oracle transportation_management 6.3.7 cpe:2.3:a:oracle:transportation_management:6.3.7:*:*:*:*:*:*:*

References for CVE-2019-17563

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00013.html Third Party Advisory
https://lists.apache.org/thread.html/8b4c1db8300117b28a0f3f743c0b9e3f964687a690cdf9662a884bbd%40%3Cannounce.tomcat.apache.org%3E Mailing List Vendor Advisory
https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/reb9a66f176df29b9a832caa95ebd9ffa3284e8f4922ec4fa3ad8eb2e%40%3Cissues.cxf.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/01/msg00024.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html Mailing List Third Party Advisory
https://seclists.org/bugtraq/2019/Dec/43 Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202003-43 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200107-0001/ Third Party Advisory
https://usn.ubuntu.com/4251-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4596 Third Party Advisory
https://www.debian.org/security/2020/dsa-4680 Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2020.html Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.html Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.html Patch Third Party Advisory
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