What is CVE-2022-0217?

CVE-2022-0217 is a high-severity vulnerability in Prosody, classified under Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion). CVSS score: 7.5/10. Published 2022-08-26.

How severe is CVE-2022-0217?

High severity. CVSS v3 base score is 7.5 out of 10.

XXE in Prosody

CVE-2022-0217

It was discovered that an internal Prosody library to load XML based on libexpat does not properly restrict the XML features allowed in parsed XML data. Given suitable attacker input, this results in expansion of recursive entity references from DTDs (CWE-776). In addition, depending on the libexpat version used, it may also allow injections using XML External Entity References (CWE-611).

Published 2022-08-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.054 (92.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.054 · newest: 0.054 · change: +0.000

Affected products

Prosody
Prosody — versions Fixed in prosody 0.11.12, Affects all versions with support for WebSockets.

Weakness classification (CWE)

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
prosody.im/security/advisory_20220113/ (Exploit, Patch, Vendor Advisory)
prosody.im/security/advisory_20220113/1.patch (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2022-0217?: CVE-2022-0217 is a high-severity vulnerability in Prosody, classified under Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion). CVSS score: 7.5/10. Published 2022-08-26.
How severe is CVE-2022-0217?: High severity. CVSS v3 base score is 7.5 out of 10.