high Known exploitedREV. 01

CVE-2017-12617Apache Tomcat — Code Execution via File Upload

Apache Tomcat servers configured to accept uploads over the web let an attacker place a server-side script on disk and then run it, taking over the application.

YOUR NEXT MOVE

Upgrade Tomcat to a fixed release, and set the default servlet back to read-only wherever uploads are not needed.

Read the risk

THE VITAL STATS
CVSS score
8.1/ 10
CVSS v3.1
EPSS probability
100%
Likelihood of exploitation
Attack complexity
High
Conditions needed to exploit
Known exploited
Yes — CISA KEV
CVE published
2017-10-04
Added to KEV
2022-03-25
Exploit published
Yes
Confidence
high
Kill chain
initial access
MITRE ATT&CK
T1190, T1505.003
Severity
high

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

Attacker needsA Tomcat instance with write access enabled on the default servlet

Behind the card

5 REFERENCES
Field-level provenanceTRACE THE SOURCES +

Which source supports each field, when it was retrieved, and who extracted it.

FieldsSourceRetrievedExtractorConfidence
cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_atnvd.nist.gov2026-08-07scrty-crds-pipeline/0.1high
exploitation.known_exploited, exploitation.kev_addedcisa.gov2026-08-07scrty-crds-pipeline/0.1high
epssapi.first.org2026-08-07scrty-crds-pipeline/0.1high
title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisitesnvd.nist.gov2026-08-07claude-codehigh

Printing history

THE RECORD
  1. r1Initial base card

First printing. This card has not been reprinted since publication.

crds:cve-2017-12617 · CRDS 0.1 · Issued 2026-08-07