CVE-2021-32919

An issue was discovered in Prosody before 0.11.9. The undocumented dialback_without_dialback option in mod_dialback enables an experimental feature for server-to-server authentication. It does not correctly authenticate remote server certificates, allowing a remote server to impersonate another server (when this option is enabled).

• CWE-295

• http://www.openwall.com/lists/oss-security/2021/05/13/1Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/05/14/2Mailing List, Mitigation, Third Party Advisory
• https://blog.prosody.im/prosody-0.11.9-released/Release Notes, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE7WRF3T7DG/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJRWLONCT2B7/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE/
• https://security.gentoo.org/glsa/202105-15Third Party Advisory
• https://www.debian.org/security/2021/dsa-4916Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/05/13/1Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/05/14/2Mailing List, Mitigation, Third Party Advisory
• https://blog.prosody.im/prosody-0.11.9-released/Release Notes, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE7WRF3T7DG/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJRWLONCT2B7/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE/
• https://security.gentoo.org/glsa/202105-15Third Party Advisory
• https://www.debian.org/security/2021/dsa-4916Third Party Advisory

Published

May 13, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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