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Vulnerability record · CVE-2021-32919 · published 13 May 2021

CVE-2021-32919: Prosody improper certificate validation vulnerability

Prosody · Prosody

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).

7.5 CVSS 3.1 High EPSS 1.4% · top 28.7% CWE-295 · Improper certificate validation
7.5CVSS 3.1 base score, v2 4.3
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

Description

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).

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

Affected products

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

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/05/13/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/14/2 Mailing ListMitigationThird Party Advisory
https://blog.prosody.im/prosody-0.11.9-released/ Release NotesVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJR
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMY
https://security.gentoo.org/glsa/202105-15 Third Party Advisory
https://www.debian.org/security/2021/dsa-4916 Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/13/1 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/14/2 Mailing ListMitigationThird Party Advisory
https://blog.prosody.im/prosody-0.11.9-released/ Release NotesVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJR
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMY
https://security.gentoo.org/glsa/202105-15 Third Party Advisory
https://www.debian.org/security/2021/dsa-4916 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-32919), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.