CVE-2019-16928Exim Out-of-bounds Write Vulnerability

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.

9.8 CRITICALEPSS 41.63%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 02:22 UTC

OverviewCVSS details

9.8CRITICALCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Sep 27, 2019
Assigner: mitre

Affected

exim (exim)

Versions: 4.92 through 4.92.2

+3 more products →

Exploitation

Public exploit: Yes · 2 references
CISA KEV: Listed · Mar 3, 2022
KEV due date: Mar 17, 2022
Ransomware use: Unknown
SSVC: Exploitation active · Automatable yes · Impact total

EPSS · FIRST, scored Nov 7

41.63%chance of exploitation in 30 days

Higher than 98.69% of CVEs

CVSS 3.1 · NVD

9.8Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 2.0 · NVD

7.5High

AV:N/AC:L/Au:N/C:P/I:P/A:P

Attack vector: Network
Attack complexity: Low
Authentication: None
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.8	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5	HIGH	2.0NVD	AV:N/AC:L/Au:N/C:P/I:P/A:P

CISA required action

⚡ Known exploited · remediation due Mar 17, 2022

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Details

CVE ID: CVE-2019-16928
Status: Analyzed
Assigner (CNA): mitre
Published: Sep 27, 2019
Last modified: 2026-06-17 02:22 UTC
Weaknesses: CWE-787

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 12:29 UTC.