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CVE-2016-5549 Oracle CVE debrief

CVE-2016-5549 is a Java libraries vulnerability in Oracle Java SE and Java SE Embedded that affects sandboxed client deployments running untrusted code. Oracle/NVD describe it as network-exploitable, but successful exploitation requires human interaction. The main risk is confidentiality exposure in Java client environments such as Java Web Start applications and Java applets; typical trusted-code server deployments are described as out of scope.

Vendor
Oracle
Product
CVE-2016-5549
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2017-01-27
Original CVE updated
2026-05-13
Advisory published
2017-01-27
Advisory updated
2026-05-13

Who should care

Organizations that still run Oracle Java clients on desktops or endpoint systems, especially Java Web Start or browser-applet workflows that load untrusted content. Security teams should focus on user endpoints and packaged client applications rather than standard server deployments that only run trusted code.

Technical summary

NVD lists this issue as affecting Oracle Java SE 7u121, 8u111, and 8u112, plus Java SE Embedded 8u111, with vulnerable CPEs covering JDK and JRE. The CVSS v3.0 vector is AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N, which matches Oracle's description of unauthenticated remote reach but required user interaction. Oracle's notice referenced by NVD indicates a patch advisory for the January 2017 CPU. The CVE description specifically says the flaw applies to deployments that rely on the Java sandbox for security, such as sandboxed Java Web Start applications or applets loading untrusted code.

Defensive priority

Medium. The score is 6.5, but the practical urgency is higher for organizations with active Java client usage, especially where users may open untrusted Java content. If Java is only used for trusted server-side code, the CVE description indicates lower relevance.

Recommended defensive actions

  • Inventory systems running Oracle Java SE / Java SE Embedded, with special attention to client endpoints using Java Web Start or applets.
  • Patch affected Java deployments using Oracle's January 2017 Critical Patch Update guidance referenced by NVD.
  • Remove or disable Java client workflows that are no longer required, especially those that depend on the Java sandbox for untrusted content.
  • Validate that endpoints are not pinned to affected versions 7u121, 8u111, or 8u112 where the CVE applies.
  • Prioritize remediation on user-facing systems because exploitation requires human interaction.

Evidence notes

All claims are based on the supplied NVD record and its reference metadata. The CVE description states the affected Oracle Java SE / Java SE Embedded versions, the sandboxed client-only applicability, network accessibility, and the need for human interaction. NVD also provides the CVSS vector and affected CPE criteria. No vendor advisory text was fetched, so remediation details are limited to the existence of Oracle's January 2017 CPU reference in the record.

Official resources

Use the CVE publication time, 2017-01-27T22:59:00.397Z, as the disclosure context. The record was later modified on 2026-05-13T00:24:29.033Z, but that is not the issue date.