CVE-2017-16944

high-risk
Published 2017-11-25

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.

Do I need to act?

!
76.0% chance of exploitation in next 30 days
EPSS score — higher than 24% of all CVEs
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
!
1 public exploit available
43184
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (3)

Affected Vendors

Debian Exim

References (18)

Mailing List http://openwall.com/lists/oss-security/2017/11/25/1
Mailing List http://openwall.com/lists/oss-security/2017/11/25/2
Mailing List http://openwall.com/lists/oss-security/2017/11/25/3
http://www.openwall.com/lists/oss-security/2021/05/04/7
Third Party Advisory http://www.securitytracker.com/id/1039873
Exploit https://bugs.exim.org/show_bug.cgi?id=2201
Mailing List https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html
Third Party Advisory https://www.debian.org/security/2017/dsa-4053
Third Party Advisory https://www.exploit-db.com/exploits/43184/
Mailing List http://openwall.com/lists/oss-security/2017/11/25/1
Mailing List http://openwall.com/lists/oss-security/2017/11/25/2
Mailing List http://openwall.com/lists/oss-security/2017/11/25/3
http://www.openwall.com/lists/oss-security/2021/05/04/7
Third Party Advisory http://www.securitytracker.com/id/1039873
Exploit https://bugs.exim.org/show_bug.cgi?id=2201
Mailing List https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html
Third Party Advisory https://www.debian.org/security/2017/dsa-4053
Third Party Advisory https://www.exploit-db.com/exploits/43184/
62
/ 100
high-risk
Severity 26/34 · High
Exploitability 27/34 · High
Exposure 9/34 · Low