Debian Security Advisory

DLA-2687-1 prosody -- LTS security update

Date Reported:
16 Jun 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-32917, CVE-2021-32921.
More information:

Two security issues have been discovered in prosody:

  • CVE-2021-32917

    The proxy65 component allows open access by default, even if neither of the users has an XMPP account on the local server, allowing unrestricted use of the server's bandwidth.

  • CVE-2021-32921

    Authentication module does not use a constant-time algorithm for comparing certain secret strings when running under Lua 5.2 or later. This can potentially be used in a timing attack to reveal the contents of secret strings to an attacker.

For Debian 9 stretch, these problems have been fixed in version 0.9.12-2+deb9u3.

We recommend that you upgrade your prosody packages.

For the detailed security status of prosody please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: