What is CVE-2020-21038?

CVE-2020-21038 is a medium-severity vulnerability in Typecho, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2023-05-08.

How severe is CVE-2020-21038?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in Typecho

CVE-2020-21038

Open redirect vulnerability in typecho 1.1-17.10.30-release via the referer parameter to Login.php.

Vulnerability class: Open Redirect

Published 2023-05-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Typecho — versions 1.1-17.10.30

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

github.com/typecho/typecho/issues/952 (Exploit)
github.com/typecho/typecho (Product)

Frequently asked questions

What is CVE-2020-21038?: CVE-2020-21038 is a medium-severity vulnerability in Typecho, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2023-05-08.
How severe is CVE-2020-21038?: Medium severity. CVSS v3 base score is 6.1 out of 10.