CISA KEV · Known exploitedCritical

CVE-2019-16928

Exim Exim Internet Mailer

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.

CVSS
9.8
EPSS
41.6%
98.5% percentile
CISA KEV
Listed
Published
2019.09.28
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability41.6%
Technical severityCVSS 9.8

Vulnerability overview

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.

Affected product and versions

Product
Exim Exim Internet Mailer
Affected versions
>= 4.92 <= 4.92.2, 19.04, 10.0, 29, 30, 31
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.03.17
  1. 1
    Identify

    Confirm that Exim Exim Internet Mailer and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787
KEV added
2022.03.03
Ransomware use
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