What is CVE-2021-41770?

CVE-2021-41770 is a high-severity vulnerability in Pingidentity Pingfederate, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2021-10-07.

How severe is CVE-2021-41770?

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

XXE in Pingidentity Pingfederate

CVE-2021-41770

Ping Identity PingFederate before 10.3.1 mishandles pre-parsing validation, leading to an XXE attack that can achieve XML file disclosure.

Vulnerability class: XXE (XML External Entity)

Published 2021-10-07 · 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:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Pingidentity Pingfederate

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

Frequently asked questions

What is CVE-2021-41770?: CVE-2021-41770 is a high-severity vulnerability in Pingidentity Pingfederate, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2021-10-07.
How severe is CVE-2021-41770?: High severity. CVSS v3 base score is 7.5 out of 10.