Is CVE-2017-16944 in the CISA KEV catalog?

No. CVE-2017-16944 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-16944?

CVE-2017-16944 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-16944?

CVE-2017-16944 has an EPSS score of 63.32% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-16944?

Upgrade exim4 on debian 11 to 4.89-13 or later.

CVE & CISA-KEV Catalog

CVE-2017-16944

HIGHEPSS 99th pctl

7.5

CVSS v3

NVD

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.

CWE-835

How to fix

Remediation Available

exim4Debian

Fixed in:4.89-13CVE-2017-16944

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

63.32%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Exploit1

bugs.exim.org

Third-Party Advisory3

Mailing List4

Other references1

openwall.com

Related Vulnerabilities

Other CWE-835 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13935	High	7.5	88%	-	Fix
CVE-2020-36227	High	7.5	78%	-	Fix
CVE-2024-20353	High	8.6	71%	KEV	-
CVE-2022-0778	High	7.5	71%	-	Fix
CVE-2019-14241	High	7.5	70%	-	-
CVE-2023-34966	High	7.5	60%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.