CVE-2019-16928

9.8 CRITICAL 42% exploit odds Drop everything exploited in the wild Fix listed Memory safety Server

What it is

Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2019-09-27 00:00 UTC ReservedThe CVE id was reserved by its CNA
2019-09-27 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2022-03-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2022-03-17 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 02:22 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 41.6% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.
It meets the bar for Drop everything: critical, and exploited or very likely to be.

Details

Published: 2019-09-27 21:15 UTC
Last modified: 2026-06-17 02:22 UTC
Added to CISA KEV: 2022-03-03
Exploit probability: 41.6% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Analyzed

Affected

Exim ≤ 4.92.2
Canonical Ubuntu Linux 19.04
Debian Linux 10.0
Fedoraproject Fedora 29
Fedoraproject Fedora 30
Fedoraproject Fedora 31

Attack profile CVSS 3.1 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2019-16928.md and follow it. Check whether this project is affected by CVE-2019-16928. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record