Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2017-16944 — Infinite Loop in Exim

CWE-835 — Infinite Loop12 documents10 sources
Severity
7.5HIGHNVD
EPSS
76.0%
top 1.08%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
3
Debian Exim4Debian LinuxExim
Timeline
PublishedNov 25
Latest updateMay 13

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.

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages2 packages

▶debiandebian/exim4< exim4 4.89-13 (bookworm)
▶NVDexim/exim4.88, 4.89+1

Also affects: Debian Linux 9.0

🔴Vulnerability Details

3
GHSA
GHSA-vpr2-5gxq-hjc6: The receive_msg function in receive↗2022-05-13
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OSV
CVE-2017-16944: The receive_msg function in receive↗2017-11-25
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CVEList
CVE-2017-16944: The receive_msg function in receive↗2017-11-25
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💥Exploits & PoCs

1
Exploit-DB
Exim 4.89 - 'BDAT' Denial of Service↗2017-11-27
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📋Vendor Advisories

3
Ubuntu
Exim vulnerability↗2017-11-29
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Red Hat
exim: infinite loop and stack exhaustion in receive_msg function via vectors involving BDAT commands↗2017-11-24
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Debian
CVE-2017-16944: exim4 - The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 a...↗2017
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💬Community

4
HackerOne
Exim handles BDAT data incorrectly and leads to crash/hang↗2019-11-12
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Bugzilla
CVE-2017-16943 CVE-2017-16944 exim: various flaws [epel-all]↗2017-11-27
▶
Bugzilla
CVE-2017-16944 exim: infinite loop and stack exhaustion in receive_msg function via vectors involving BDAT commands↗2017-11-27
▶
Bugzilla
CVE-2017-16943 CVE-2017-16944 exim: various flaws [fedora-all]↗2017-11-27
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