CVE-2020-2601Network attack vector

Data disclosure via unsafe Kerberos checksum

Published Jan 15, 2020 · Updated Sep 30, 2024

Information disclosure in Oracle Java SE 7u241, 8u231, 11.0.5, and 13.0.1 allows remote attackers to read critical data via Kerberos. Kerberos TGS processing uses an unsafe RSA-MD5 checksum; public sources do not disclose the affected method or exact data-recovery sequence. Exploitation requires a difficult Kerberos network path plus a sandboxed applet or Web Start application running untrusted code, or a service passing untrusted data to the affected Security APIs.

CVSS severity6.8
Medium
EPSS probability4.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Information disclosure in Oracle Java SE 7u241, 8u231, 11.0.5, and 13.0.1 allows remote attackers to read critical data via Kerberos. Kerberos TGS processing uses an unsafe RSA-MD5 checksum; public sources do not disclose the affected method or exact data-recovery sequence. Exploitation requires a difficult Kerberos network path plus a sandboxed applet or Web Start application running untrusted code, or a service passing untrusted data to the affected Security APIs.

The record

CVE
CVE-2020-2601
Published
Jan 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. 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

6.8NISTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
4.3NISTAV:N/AC:M/Au:N/C:P/I:N/A:N
6.8Oracle CorporationCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo