Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since May 1, 2023.
CVE-2021-45046
Apache Log4j2 Deserialization of Untrusted Data Vulnerability
Added to KEV May 1, 2023
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2021-45046
- CWE
- CWE-917
- Affected products
- Log4j2 · Apache Log4j2 · Apache
What happened
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.
What it means for your business
Apache Log4j2 is listed in CISA's Known Exploited Vulnerabilities catalog (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. CISA remediation due date: 2023-05-22. If you need help checking exposure, call (864) 335-9223.
Required action
Apply updates per vendor instructions.
CISA due date: May 22, 2023
Sources
Related briefs
Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
Citrix NetScaler is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-88779). Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service. CISA remediation due date: 2026-10-07. If you need help checking exposure, call (864) 335-9223.
Heap buffer overflow in ANGLE in Microsoft Edge vulnerability
Heap buffer overflow in ANGLE in Microsoft Edge vulnerability (CVE-2025-10502) was added to Microsoft’s security update guidance. Information published. If you need help checking exposure, call (864) 335-9223.
Microsoft Exchange Server Elevation of Privilege vulnerability
Microsoft Exchange Server Elevation of Privilege vulnerability (CVE-2026-96940) was added to Microsoft’s security update guidance. Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network. If you need help checking exposure, call (864) 335-9223.
Fortinet FortiMail Path Traversal Vulnerability
Fortinet FortiMail is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-104286). Fortinet FortiMail contains a path traversal and an improper neutralization of NULL byte or NULL character vulnerability that may allow an unauthenticated attacker to write arbitrary files on the underlying system via crafted HTTP or HTTPS requests. CISA remediation due date: 2026-10-04. If you need help checking exposure, call (864) 335-9223.
Need help patching?
PremierePC monitors KEV alerts for managed clients and helps teams prioritize remediation before attackers do.