KEV'd: CVE-2021-45046, CVE-2023-21839, and CVE-2023-1389

On Monday, May 1, 2023, CISA added CVE-2021-45046, CVE-2023-21839, and CVE-2023-1389 to the Known Exploited Vulnerabilities (KEV) list. For all three CVEs, GreyNoise users had visibility into which IPs were attempting mass exploitation prior to their addition to the KEV list. GreyNoise tags allow organizations to monitor and prioritize the handling of alerts regarding benign and, in this case, malicious IPs.

CVE	CVE Description	Tag Date	KEV Date
CVE-2021-45046	Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.	December 9, 2021	May 1, 2023
CVE-2023-21839	Oracle WebLogic Server contains an unspecified vulnerability that allows an unauthenticated attacker with network access via T3, IIOP, to compromise Oracle WebLogic Server.	March 6, 2023	May 1, 2023
CVE-2023-1389	TP-Link Archer AX-21 contains a command injection vulnerability that allows for remote code execution.	April 25, 2023	May 1, 2023

Bonus Update:

On Thursday, April 27, 2023, GreyNoise released a tag for the critically scored CVE-2023-21554, QueueJumper, a Microsoft message queuing remote code execution vulnerability.

As of this publication, we have not observed mass exploitation attempts, but have observed >600 IPs that are attempting to discover Internet-facing Microsoft Windows devices that respond over Microsoft Message Queuing (MSMQ) binary protocol.

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