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Vulnerability record · CVE-2017-9801 · published 7 August 2017

CVE-2017-9801: Apache commons email improper input validation vulnerability

Apache · Commons Email

When a call-site passes a subject for an email that contains line-breaks in Apache Commons Email 1.0 through 1.4, the caller can add arbitrary SMTP headers.

7.5 CVSS 3.0 High EPSS 6.0% · top 6.9% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
6.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

When a call-site passes a subject for an email that contains line-breaks in Apache Commons Email 1.0 through 1.4, the caller can add arbitrary SMTP headers.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/100082 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039043 Third Party AdvisoryVDB Entry
https://lists.apache.org/thread.html/7ef903a772a2ff08605df1be819044fb15df2815eb3d63878b3fbbb5%40%3Cannounce.apache.org%3
http://www.securityfocus.com/bid/100082 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039043 Third Party AdvisoryVDB Entry
https://lists.apache.org/thread.html/7ef903a772a2ff08605df1be819044fb15df2815eb3d63878b3fbbb5%40%3Cannounce.apache.org%3

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-9801), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.