CVE-2023-21839 Oracle WebLogic Server: software flaw
In plain words: A mistake in the software that attackers have found a way to abuse. Depends on the product — see the description and the vendor advisory.
Confirmed exploited by CISA on · US federal patch deadline May 22, 2023
What to do
- Install Oracle's security update for WebLogic Server. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Oracle WebLogic Server Unspecified Vulnerability
- Product
- Oracle WebLogic Server
- CISA description
- Oracle WebLogic Server contains an unspecified vulnerability that allows an unauthenticated attacker with network access via T3, IIOP, to compromise Oracle WebLogic Server.
- Type of flaw
- Software flaw
- Confirmed exploited
- May 1, 2023
- US federal patch deadline
- May 22, 2023
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Answering about CVE-2023-21839 ·
Questions about CVE-2023-21839
Is CVE-2023-21839 being exploited?
Yes. CISA added CVE-2023-21839 to its Known Exploited Vulnerabilities catalog on May 1, 2023, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2023-21839?
Install Oracle's security update for WebLogic Server. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2023-21839?
Only if you use Oracle WebLogic Server. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.