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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.

Severity
High 7.5
Published
25 Nov 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
63% in the next 30 daysHigher than 99% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Infinite loop (CWE-835)
Attack
Over the network · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
EximServers and applications · cpe:a:exim:exim
  • Version 4.88
  • Version 4.89

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-16944
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-16944