CVE-2019-16928
Published: March 3, 2022
Official Description
Exim contains an out-of-bounds write vulnerability which can allow for remote code execution.
CISA KEV Advisory
Exim Out-of-bounds Write Vulnerability
Exim contains an out-of-bounds write vulnerability which can allow for remote code execution.
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in Exim is an out-of-bounds write that can enable remote code execution. With a high EPSS score of 0.89816 and its presence in CISA's KEV, this flaw is actively exploited and poses a significant risk.
This vulnerability has been actively exploited in the wild and is included in CISA's KEV, confirming its use in real-world attacks. The nature of the flaw indicates it is remotely exploitable.
It is critical to update Exim to a patched version to remediate this vulnerability. Regularly review and apply security updates for all mail server software.
Technical Analysis
CVE-2019-16928 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2019-16928 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-16928 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1