CVE-2021-20845

Name: CVE-2021-20845
Creator: NVD / NIST
Published: 2021-11-24T16:15:13.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.51%

Last modified Jun 17, 2026

CVE-2021-20845 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Cross-site request forgery (CSRF) vulnerability in Unlimited Sitemap Generator versions prior to v8.2 allows a remote attacker to hijack the authentication of an administrator and conduct arbitrary operation via a specially crafted web page.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

Description

Cross-site request forgery (CSRF) vulnerability in Unlimited Sitemap Generator versions prior to v8.2 allows a remote attacker to hijack the authentication of an administrator and conduct arbitrary operation via a specially crafted web page.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.51%

39.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Xml-Sitemaps	Unlimited Sitemap Generator	< 8.2

References

https://jvn.jp/en/jp/JVN58407606/index.htmlThird Party Advisory
https://www.xml-sitemaps.com/news-20210831.htmlRelease Notes, Vendor Advisory
https://www.xml-sitemaps.com/standalone-google-sitemap-generator.htmlProduct, Vendor Advisory
https://jvn.jp/en/jp/JVN58407606/index.htmlThird Party Advisory
https://www.xml-sitemaps.com/news-20210831.htmlRelease Notes, Vendor Advisory
https://www.xml-sitemaps.com/standalone-google-sitemap-generator.htmlProduct, Vendor Advisory

Timeline

Published: Nov 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20845?

How severe is CVE-2021-20845?

CVE-2021-20845 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20845?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20845?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST