CVE-2020-2803Network attack vector

Unauthenticated takeover of sandboxed client runtime

Published Apr 15, 2020 · Updated Sep 30, 2024

An undisclosed Libraries flaw in Oracle Java SE 7u251, 8u241, 11.0.6, and 14 allows remote attackers to take over the runtime. Oracle has not published the defective library operation or the untrusted input that triggers it. Exploitation requires user interaction and a client deployment that runs untrusted applet or Web Start code inside the Java sandbox; trusted-code-only servers are not affected.

CVSS severity8.3
High
EPSS probability6.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An undisclosed Libraries flaw in Oracle Java SE 7u251, 8u241, 11.0.6, and 14 allows remote attackers to take over the runtime. Oracle has not published the defective library operation or the untrusted input that triggers it. Exploitation requires user interaction and a client deployment that runs untrusted applet or Web Start code inside the Java sandbox; trusted-code-only servers are not affected.

The record

CVE
CVE-2020-2803
Published
Apr 15, 2020
Updated
Sep 30, 2024
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Java SE: 7u251, 8u241, 11.0.6, 14
  2. Affected versionversion=Java SE Embedded: 8u241

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Java SE: 7u251, 8u241, 11.0.6, 14; version=Java SE Embedded: 8u241

Published CVSS scores

8.3Oracle CorporationCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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