CVE-2019-10149

Exim Mail Transfer Agent (MTA): Improper Input Validation

As of , CVE-2019-10149 in Exim Mail Transfer Agent (MTA) is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 10 January 2022
US federal deadline
10 July 2022181 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.99Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
Public exploit
1 Metasploit module and 3 Exploit-DB entries (2 verified)
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.

CISA's description

A flaw was found in Exim versions 4.87 to 4.91 (inclusive). Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.

The CVE record's description, from redhat

CVE published
5 June 2019
Assigned by
redhat
CVSS
9.0 Critical (CVSS 3.0, from the CNA)
CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. Exploit-DB published an exploit (EDB-ID 46974).
  3. Exploit-DB published an exploit (EDB-ID 46996).
  4. Exploit-DB published an exploit (EDB-ID 47307).
  5. CISA added it to its list of exploited vulnerabilities.
  6. The US federal deadline to fix it.

Public exploits

Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.

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