What is CVE-2020-21524?

CVE-2020-21524 is a critical-severity vulnerability in Halo, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.1/10. Published 2020-09-30.

How severe is CVE-2020-21524?

Critical severity. CVSS v3 base score is 9.1 out of 10.

XXE in Halo

CVE-2020-21524

There is a XML external entity (XXE) vulnerability in halo v1.1.3, The function of importing other blogs in the background(/api/admin/migrations/wordpress) needs to parse the xml file, but it is not used for security defense, This vulnerability can detect the intranet, read files, enable ddos attacks, etc. exp:https://github.com/halo-dev/halo/issues/423

Vulnerability class: XXE (XML External Entity)

EPSS: 0.015 (71.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Affected products

Halo — versions 1.1.3
N/a — versions n/a

Weakness classification (CWE)

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

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2020-21524?: CVE-2020-21524 is a critical-severity vulnerability in Halo, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.1/10. Published 2020-09-30.
How severe is CVE-2020-21524?: Critical severity. CVSS v3 base score is 9.1 out of 10.