CVE-2017-16943

Name: CVE-2017-16943
Creator: NVD / NIST
Published: 2017-11-25T17:29:00.26+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 46.71%

Last modified Jun 17, 2026

CVE-2017-16943 is a vulnerability of currently unknown severity. The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands.. EPSS estimates a 46.71% chance of exploitation in the next 30 days.

Description

The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands.

Metrics

EPSS Probability

46.71%

98.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Exim	Exim	4.88
Exim	Exim	4.89
Debian	Debian Linux	9.0

References

http://openwall.com/lists/oss-security/2017/11/25/1Mailing List
http://openwall.com/lists/oss-security/2017/11/25/2Mailing List
http://openwall.com/lists/oss-security/2017/11/25/3Mailing List
http://www.openwall.com/lists/oss-security/2021/05/04/7
http://www.securitytracker.com/id/1039872Third Party Advisory, VDB Entry
https://bugs.exim.org/show_bug.cgi?id=2199Exploit, Issue Tracking
https://git.exim.org/exim.git/commit/4090d62a4b25782129cc1643596dc2f6e8f63bdePatch
https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4Patch
https://github.com/LetUsFsck/PoC-Exploit-Mirror/tree/master/CVE-2017-16944Exploit
https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.htmlMailing List
https://www.debian.org/security/2017/dsa-4053Third Party Advisory
http://openwall.com/lists/oss-security/2017/11/25/1Mailing List
http://openwall.com/lists/oss-security/2017/11/25/2Mailing List
http://openwall.com/lists/oss-security/2017/11/25/3Mailing List
http://www.openwall.com/lists/oss-security/2021/05/04/7
http://www.securitytracker.com/id/1039872Third Party Advisory, VDB Entry
https://bugs.exim.org/show_bug.cgi?id=2199Exploit, Issue Tracking
https://git.exim.org/exim.git/commit/4090d62a4b25782129cc1643596dc2f6e8f63bdePatch
https://git.exim.org/exim.git/commitdiff/4e6ae6235c68de243b1c2419027472d7659aa2b4Patch
https://github.com/LetUsFsck/PoC-Exploit-Mirror/tree/master/CVE-2017-16944Exploit
https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.htmlMailing List
https://www.debian.org/security/2017/dsa-4053Third Party Advisory

Timeline

Published: Nov 25, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-16943?

How severe is CVE-2017-16943?

Severity scoring for CVE-2017-16943 is pending analysis. The EPSS model estimates a 46.71% probability of exploitation in the next 30 days.

How do I fix CVE-2017-16943?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-16943?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST