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CVE-2017-16944

7.5 · HIGH

The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT c…

Published Nov 25, 2017CWE-835EPSS 63.36%

Overview

CVE-2017-16944 is a high-severity vulnerability. It was published on November 25, 2017 and has a CVSS 3.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content, related to the bdat_getc function.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refopenwall.com/lists/oss-security/2017/11/25/1Refopenwall.com/lists/oss-security/2017/11/25/2Refopenwall.com/lists/oss-security/2017/11/25/3Refwww.openwall.com/lists/oss-security/2021/05/04/7Refwww.securitytracker.com/id/1039873Refbugs.exim.org/show_bug.cgi?id=2201Reflists.exim.org/lurker/message/20171125.034842.d1d75cac.en.htmlRefwww.debian.org/security/2017/dsa-4053Refwww.exploit-db.com/exploits/43184/Refopenwall.com/lists/oss-security/2017/11/25/1

How CyberStrike helps

Frequently asked questions

What is CVE-2017-16944?

CVE-2017-16944 is a high-severity vulnerability. It was published on November 25, 2017 and has a CVSS 3.0 base score of 7.5 (HIGH).

How severe is CVE-2017-16944?

This vulnerability has a CVSS 3.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-16944?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-16944?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-16944 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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