What is CVE-2021-3869?

CVE-2021-3869 is a high-severity vulnerability in Stanford Corenlp, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2021-10-19.

How severe is CVE-2021-3869?

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

XXE in Stanford Corenlp

CVE-2021-3869

corenlp is vulnerable to Improper Restriction of XML External Entity Reference

Vulnerability class: XXE (XML External Entity)

Published 2021-10-19 · 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: 0.014 (70.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Stanford Corenlp
Stanfordnlp Stanfordnlp/corenlp — versions unspecified

Weakness classification (CWE)

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

References

huntr.dev/bounties/2f8baf6c-14b3-420d-8ede-9805797cd324 (Exploit, Patch, Third Party Advisory)
github.com/stanfordnlp/corenlp/commit/5d83f1e8482ca304db8be726cad89554c88f136a (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3869?: CVE-2021-3869 is a high-severity vulnerability in Stanford Corenlp, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 7.5/10. Published 2021-10-19.
How severe is CVE-2021-3869?: High severity. CVSS v3 base score is 7.5 out of 10.