CVE-2021-38542

Apache James vulnerable to STARTTLS command injection (IMAP and POP3)

Description

Apache James prior to release 3.6.1 is vulnerable to a buffering attack relying on the use of the STARTTLS command. This can result in Man-in -the-middle command injection attacks, leading potentially to leakage of sensible information.

Remediation

Workaround:

  • We recommend to upgrade to Apache James 3.6.1, which fixes this vulnerability. Furthermore, we recommend, if possible to dis-activate STARTTLS and rely solely on explicit TLS for mail protocols, including SMTP, IMAP and POP3.

Categories

5.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.28%
Third-Party Advisory openwall.com Third-Party Advisory openwall.com Third-Party Advisory openwall.com
Affected: Apache Software Foundation Apache James
Published at:
Updated at:

References

Frequently Asked Questions

What is the severity of CVE-2021-38542?
CVE-2021-38542 has been scored as a medium severity vulnerability.
How to fix CVE-2021-38542?
As a workaround for remediating CVE-2021-38542: We recommend to upgrade to Apache James 3.6.1, which fixes this vulnerability. Furthermore, we recommend, if possible to dis-activate STARTTLS and rely solely on explicit TLS for mail protocols, including SMTP, IMAP and POP3.
Is CVE-2021-38542 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-38542 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-38542?
CVE-2021-38542 affects Apache Software Foundation Apache James.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.