Use After Free in Exim
CVE-2017-16943
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.
Vulnerability class: Use-After-Free
EPSS: 0.745 (98.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Exim — versions 4.88, 4.89
- Debian Debian_linux — versions 9.0
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_SECTRACK)
- cve@mitre.org (Mailing List, x_refsource_MISC)
- cve@mitre.org (Patch, x_refsource_MISC)
- cve@mitre.org (Mailing List, x_refsource_MISC)
- cve@mitre.org (Exploit, x_refsource_MISC)
- cve@mitre.org (Mailing List, x_refsource_MISC)
- cve@mitre.org (Patch, x_refsource_MISC)
- cve@mitre.org (Mailing List, x_refsource_MISC)
- cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- cve@mitre.org (Exploit, x_refsource_MISC, Issue Tracking)
Frequently asked questions
- What is CVE-2017-16943?
- CVE-2017-16943 is a critical-severity vulnerability in Exim, classified under Use After Free. CVSS score: 9.8/10. Published 2017-11-25.
- How severe is CVE-2017-16943?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2017-16943 known to be exploited?
- 10 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.