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CVE-2019-16928 is a heap-based buffer overflow in the string_vformat function in string.c in Exim versions 4.92 through 4.92.2. A specially crafted, extraordinarily long EHLO command can reach the vulnerable formatting path and crash the receiving Exim process. The flaw may also permit remote code execution through reachable paths, although the known exploitation mode drops privileges before reaching the vulnerable code and other potentially exploitable paths were not established.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap-based overflow in Exim triggered by sending a long HELO command, mentioned as potentially exploitable using similar techniques to CVE-2018-6789.
A critical heap-based buffer overflow in Exim (string_vformat) that can be triggered via an extraordinarily long EHLO string, causing denial of service and potentially enabling remote code execution.
A critical heap-based buffer overflow in Exim (string_vformat) that can enable arbitrary code execution; under certain conditions (e.g., combined with local privilege escalation or other code paths), it may be leveraged to achieve root-level code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.