What is CVE-2020-15303?

CVE-2020-15303 is a medium-severity vulnerability in Infoblox Nios, classified under Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion). CVSS score: 6.5/10. Published 2021-06-28.

How severe is CVE-2020-15303?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XXE in Infoblox Nios

CVE-2020-15303

Infoblox NIOS before 8.5.2 allows entity expansion during an XML upload operation, a related issue to CVE-2003-1564.

Published 2021-06-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (56.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Infoblox Nios — versions 8.5.0, 8.5.1

Weakness classification (CWE)

CWE-776 — Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion)

References

www.infoblox.com/products/nios8/ (Product, Vendor Advisory)
community.infoblox.com/t5/Security/NIOS-XML-Vulnerability/m-p/22437 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-15303?: CVE-2020-15303 is a medium-severity vulnerability in Infoblox Nios, classified under Improper Restriction of Recursive Entity References in DTDs (XML Entity Expansion). CVSS score: 6.5/10. Published 2021-06-28.
How severe is CVE-2020-15303?: Medium severity. CVSS v3 base score is 6.5 out of 10.