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Actively exploitedKnown ransomware use

CVE-2013-0431 Oracle JRE Sandbox Bypass Vulnerability

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle allows remote attackers to bypass the Java security sandbox.

From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.

Our Assessment

Should You Worry?

Patch nowCybergen assessment
  • CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 25 May 2022.
  • CISA lists it as known to be used in ransomware campaigns.
  • Rated Low severity (CVSS 3.7, scored by CISA).
  • It has been in the catalogue for 1,626 days. Systems still unpatched now have almost certainly been scanned for it.
The Vulnerability

What It Is

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 through Update 11, and OpenJDK 7, allows user-assisted remote attackers to bypass the Java security sandbox via unspecified vectors related to JMX, aka "Issue 52," a different vulnerability than CVE-2013-1490.

From Watch to Action

What To Do Now

  1. 1

    Find it

    Search your asset inventory and external attack surface for Oracle Java Runtime Environment (JRE). Include cloud images, appliances and anything a supplier runs for you.

    Attack Surface Management
  2. 2

    Fix it

    Apply updates per vendor instructions.

    Vulnerability Management
  3. 3

    Hunt for compromise

    If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.

    Incident Response
  4. 4

    Prove it is fixed

    Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.

    Penetration Testing

Vendor Advisories

Regulation

The Compliance Clock

Cyber EssentialsCyber Essentials requires high and critical updates (CVSS 7.0 or above) within 14 days of release. Treat any exploited flaw the same way.NIS2If exploitation causes a significant incident, essential and important entities owe their CSIRT an early warning within 24 hours and a notification within 72 hours.DORAFinancial entities must classify ICT incidents and send an initial notification for a major incident within strict deadlines, with exploited flaws a common cause.US federal (BOD 22-01)Federal civilian agencies had until 15 Jun 2022 to remediate. A sensible benchmark for everyone else.

General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.

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Evidence

Sources

  1. CISA Known Exploited Vulnerabilities catalogue
  2. NVD: CVE-2013-0431
  3. CVE record: CVE-2013-0431
  4. FIRST EPSS
  5. oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19418
  6. security.gentoo.org/glsa/glsa-201406-32.xml
  7. mandriva.com/security/advisories?name=MDVSA-2013:095
  8. informationweek.com/security/application-security/java-hacker-uncovers-two-flaws-in-latest/240146717
  9. us-cert.gov/cas/techalerts/TA13-032A.html
  10. seclists.org/fulldisclosure/2013/Jan/142
  11. kb.cert.org/vuls/id/858729
  12. rhn.redhat.com/errata/RHSA-2013-0237.html