CVE-2020-2593Network attack vector

Data read and modification via incorrect URL normalization

Published Jan 15, 2020 · Updated Sep 30, 2024

URL normalization flaw in Oracle Java SE 7u241, 8u231, 11.0.5, and 13.0.1 allows remote attackers to read and modify accessible data. The java.net.URL isBuiltinStreamHandler check incorrectly classifies handlers as built in and consequently normalizes crafted URLs incorrectly. Reachability requires a deployment that runs untrusted sandboxed code or passes attacker-controlled network data to Networking APIs; successful attacks affect only Java-accessible data.

CVSS severity4.8
Medium
EPSS probability2.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URL normalization flaw in Oracle Java SE 7u241, 8u231, 11.0.5, and 13.0.1 allows remote attackers to read and modify accessible data. The java.net.URL isBuiltinStreamHandler check incorrectly classifies handlers as built in and consequently normalizes crafted URLs incorrectly. Reachability requires a deployment that runs untrusted sandboxed code or passes attacker-controlled network data to Networking APIs; successful attacks affect only Java-accessible data.

The record

CVE
CVE-2020-2593
Published
Jan 15, 2020
Updated
Sep 30, 2024
Vendor
Oracle Corporation
Product
Java Platform, Standard Edition (Java SE)
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 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: 7u241, 8u231, 11.0.5, 13.0.1
  2. Affected versionversion=Java SE Embedded: 8u231

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Java SE: 7u241, 8u231, 11.0.5, 13.0.1; version=Java SE Embedded: 8u231

Published CVSS scores

5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
4.8OracleCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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