What’s Vulnerable › Vulnerabilities

CVE-2023-5422: SSL Certificates are not checked for E-Mail Handling

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-16 · updated 2026-06-17
• Weakness: CWE-295

Description

The functions to fetch e-mail via POP3 or IMAP as well as sending e-mail via SMTP use OpenSSL for static SSL or TLS based communication. As the SSL_get_verify_result() function is not used the certificated is trusted always and it can not be ensured that the certificate satisfies all necessary security requirements. This could allow an attacker to use an invalid certificate to claim to be a trusted host, use expired certificates, or conduct other attacks that could be detected if the certificate is properly validated. This issue affects OTRS: from 7.0.X before 7.0.47, from 8.0.X before 8.0.37; ((OTRS)) Community Edition: from 6.0.X through 6.0.34.

Affected products

• OTRS AG OTRS: from 6.0.0 through 6.0.34; from 7.0.0 before 7.0.47; from 8.0.0 before 8.0.37 — fixed in 7.0.47, 8.0.37

How to fix

Upgrade to a fixed version: OTRS AG OTRS 7.0.47, 8.0.37. Check the vendor advisory for mitigations.

References

• https://otrs.com/release-notes/otrs-security-advisory-2023-10/
• https://otrs.com/release-notes/otrs-security-advisory-2023-10/

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