Vulnerability in Exim
CVE-2017-16944
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.634 (99.2th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.420 · newest: 0.634 · change: +0.214
Affected products
- Exim — versions 4.88, 4.89
- Debian Linux — versions 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html (Mailing List)
- openwall.com/lists/oss-security/2017/11/25/3 (Mailing List)
- bugs.exim.org/show_bug.cgi (Exploit, Issue Tracking)
- openwall.com/lists/oss-security/2017/11/25/1 (Mailing List)
- www.securitytracker.com/id/1039873 (VDB Entry, Third Party Advisory, vdb-entry)
- openwall.com/lists/oss-security/2017/11/25/2 (Mailing List)
- www.debian.org/security/2017/dsa-4053 (vendor-advisory, Third Party Advisory)
- www.exploit-db.com/exploits/43184/ (VDB Entry, Third Party Advisory, exploit)
- www.openwall.com/lists/oss-security/2021/05/04/7 (mailing-list)
Frequently asked questions
- What is CVE-2017-16944?
- CVE-2017-16944 is a high-severity vulnerability in Exim, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2017-11-25.
- How severe is CVE-2017-16944?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2017-16944 known to be exploited?
- 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.