Exim < 4.90.1 Buffer Overflow RCE Vulnerability

high Nessus Plugin ID 107149
New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it is different from CVSS.

VPR Score: 8.4


The remote mail server is potentially affected by a buffer overflow vulnerability.


According to its banner, the version of Exim running on the remote host is prior to 4.90.1. It is, therefore, potentially affected by a buffer overflow vulnerability. A flaw exists base64d() function due to improper validation of parsed messages. A remote attacker could potentially cause a buffer overflow condition and execute arbitrary code.


Upgrade to Exim 4.90.1 or later.

See Also





Plugin Details

Severity: High

ID: 107149

File Name: exim_4_90_1.nasl

Version: 1.9

Type: remote

Published: 3/6/2018

Updated: 11/8/2019

Dependencies: smtpserver_detect.nasl

Configuration: Enable paranoid mode

Risk Information

Risk Factor: High

VPR Score: 8.4

CVSS Score Source: CVE-2018-6789

CVSS v2.0

Base Score: 7.5

Temporal Score: 6.2

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

Temporal Vector: E:F/RL:OF/RC:C

CVSS v3.0

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:exim:exim

Required KB Items: Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/10/2018

Vulnerability Publication Date: 2/7/2018

Exploitable With


Reference Information

CVE: CVE-2018-6789

BID: 103049