9.8Critical KEV

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

exim exim; canonical ubuntu linux; debian debian linux; fedoraproject fedora Published: 2019-09-27 23:07 (7 years ago)

Known exploited — Exim Out-of-bounds Write Vulnerability

CISA confirmed this vulnerability is used in real attacks on 03.03.2022. Remediation deadline for US federal agencies: 17.03.2022.

Required action: Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2019-16928

Description

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.

Weakness (CWE): CWE-787

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

Vendor	Product	Versions
canonical	ubuntu linux	19.04
debian	debian linux	10.0
exim	exim	4.92 – ≤ 4.92.2
fedoraproject	fedora	29

References and patches

https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html Vendor Advisory
https://bugs.exim.org/show_bug.cgi?id=2449 Issue TrackingPatchVendor Advisory
https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f Patch
[oss-security] 20190928 Exim CVE-2019-16928 RCE using a heap-based buffer overflow mailing-listExploitMailing ListMitigation
[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow mailing-listExploitMailing ListThird Party Advisory
[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow mailing-listMailing ListThird Party Advisory
DSA-4536 vendor-advisoryThird Party Advisory
USN-4141-1 vendor-advisoryThird Party Advisory
[oss-security] 20190929 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow mailing-listMailing ListThird Party Advisory
20190929 [SECURITY] [DSA 4536-1] exim4 security update mailing-listMailing ListThird Party Advisory
FEDORA-2019-006dfc94cd vendor-advisoryRelease Notes
FEDORA-2019-e080507ba5 vendor-advisoryRelease Notes
FEDORA-2019-d778bd4137 vendor-advisoryRelease Notes
GLSA-202003-47 vendor-advisoryThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-16928 US Government Resource

CPE matches (NVD) (6)

cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:* ≥ 4.92 ≤ 4.92.2
cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

CVSS score

9.8Critical

Source: CISA-ADP · CVSS 3.1

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

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

All scores (4)

CISA-ADP	CVSS 3.1	9.8Critical
nvd	CVSS 3.1	9.8Critical
134c704f-9b21-4f2e-91b3-4a467353bcc0	CVSS 3.1	9.8Critical
nvd	CVSS 2.0	7.5High

EPSS (chance of exploitation in 30 days)

41.64%

higher than 99% of all CVEs

CISA assessment (SSVC)

Exploitation: active
Automatable: yes
Technical impact: total

Timeline

ID reserved2019-09-27
Published2019-09-27 23:07
Reached IP-DB2026-10-24 23:33
Added to KEV2022-03-03
Last updated2026-06-17 05:22

Assigned by (CNA): mitre
NVD status: Analyzed

View at source: CVE.org · NVD

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