CVE-2019-10149
9.8, critical Known exploitedExim Mail Transfer Agent (MTA) Improper Input Validation
- CVSS
- 9.8, critical critical CVSS v3.1
- EPSS, next 30 days
- 100% higher than 99.9% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 5 Jun 20197 years ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 10 Jan 2022. US federal agencies had to remediate by 10 Jul 2022, a deadline that has passed.
Required action. Apply updates per vendor instructions.
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.
Details
- Vendor
- Exim
- Product
- exim
- Weakness
- CWE-78 (opens in a new tab)
- Status
- Analyzed
- Updated
- 17 Jun 2026
- Assigner
- secalert@redhat.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References 21
Exploit code 6
- packetstormsecurity.com /files/153218/Exim-4.9.1-Remote-Command-Execution.html (opens in a new tab)
- packetstormsecurity.com /files/153312/Exim-4.91-Local-Privilege-Escalation.html (opens in a new tab)
- packetstormsecurity.com /files/154198/Exim-4.91-Local-Privilege-Escalation.html (opens in a new tab)
- seclists.org /fulldisclosure/2019/Jun/16 (opens in a new tab)
- openwall.com /lists/oss-security/2019/06/05/4 (opens in a new tab)
- openwall.com /lists/oss-security/2019/06/06/1 (opens in a new tab)
Patches and fixes 1
Advisories 13
- lists.opensuse.org /opensuse-security-announce/2019-06/msg00020.html (opens in a new tab)
- openwall.com /lists/oss-security/2019/06/05/2 (opens in a new tab)
- openwall.com /lists/oss-security/2019/07/25/6 (opens in a new tab)
- openwall.com /lists/oss-security/2019/07/25/7 (opens in a new tab)
- openwall.com /lists/oss-security/2019/07/26/4 (opens in a new tab)
- openwall.com /lists/oss-security/2021/05/04/7 (opens in a new tab)
- securityfocus.com /bid/108679 (opens in a new tab)
- bugzilla.redhat.com /show_bug.cgi?id=CVE-2019-10149 (opens in a new tab)
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other Exim CVEs
Every Exim CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2019-16928 Exim Out-of-bounds Write Vulnerability KEV EPSS 42% 9.8, critical
- CVE-2018-6789 Exim Buffer Overflow Vulnerability KEV EPSS 82% 9.8, critical
- CVE-2010-4344 Exim Heap-Based Buffer Overflow Vulnerability KEV EPSS 72% 9.8, critical
- CVE-2010-4345 Exim Privilege Escalation Vulnerability KEV EPSS 18% 7.8, high
- CVE-2026-94056 Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data… EPSS 0.2% 7.5, high
Beyond this page
Is CVE-2019-10149 in your network?
This page tells you how dangerous CVE-2019-10149 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2019-10149 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2019-10149 comes with the devices to patch.
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EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
Learn more about EXYS7950 KONDRA
Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 18 Oct 2026, not the live upstream state.