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Vulnerability record · CVE-2023-51747 · published 27 February 2024

CVE-2023-51747: Apache james improper input validation vulnerability

Apache · James

Apache James prior to versions 3.8.1 and 3.7.5 is vulnerable to SMTP smuggling. A lenient behaviour in line delimiter handling might create a difference of interpretation between the sender and the receiver which can be exploited by an attacker to forge an SMTP envelop, allowing for instance to bypass SPF checks. The patch implies enforcement of CRLF as a line delimiter as part of the DATA transaction. We recommend James users to upgrade to non vulnerable versions.

7.1 CVSS 3.1 High EPSS 1.0% · top 37.3% CWE-20 · Improper input validationCWE-290 · Authentication bypass by spoofing
7.1CVSS 3.1 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

Apache James prior to versions 3.8.1 and 3.7.5 is vulnerable to SMTP smuggling. A lenient behaviour in line delimiter handling might create a difference of interpretation between the sender and the receiver which can be exploited by an attacker to forge an SMTP envelop, allowing for instance to bypass SPF checks. The patch implies enforcement of CRLF as a line delimiter as part of the DATA transaction. We recommend James users to upgrade to non vulnerable versions.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Affected products

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

References

LinkTags
http://www.openwall.com/lists/oss-security/2024/02/27/4 Mailing ListThird Party Advisory
https://lists.apache.org/thread/rxkwbkh9vgbl9rzx1fkllyk3krhgydko Mailing ListVendor Advisory
https://postfix.org/smtp-smuggling.html Product
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Product
http://www.openwall.com/lists/oss-security/2024/02/27/4 Mailing ListThird Party Advisory
https://lists.apache.org/thread/rxkwbkh9vgbl9rzx1fkllyk3krhgydko Mailing ListVendor Advisory
https://postfix.org/smtp-smuggling.html Product
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Product

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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-2023-51747), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.