Critical severity · published Feb 8, 2018
CVE-2018-6789
Exim Buffer Overflow Vulnerability
RansomwareIn wildKEV
9.8
CVSS
82.1%
EPSS
Yes
On KEV
Description
An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)82.1% · higher than 100% of CVEs
Exploited in the wildYes
CISA KEVListed Nov 3, 2021
Federal remediation dueMay 3, 2022
Ransomware campaign useKnown
Affected products
Which versions
DL
Debian Linux · Debian
7.0; 8.0; 9.0 · source: NVD
EX
Exim · Exim
before 4.90.1 · source: NVD, KEV
UL
Ubuntu Linux · Canonical
14.04; 16.04; 17.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-6789
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-6789
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
x_refsource_CONFIRM
https://exim.org/static/doc/security/CVE-2018-6789.txt
mailing-list
http://www.openwall.com/lists/oss-security/2018/02/07/2
vendor-advisory
https://usn.ubuntu.com/3565-1/
x_refsource_CONFIRM
http://openwall.com/lists/oss-security/2018/02/10/2
vdb-entry
http://www.securitytracker.com/id/1040461
vendor-advisory
https://www.debian.org/security/2018/dsa-4110
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