CVE-2021-3312

Name: CVE-2021-3312
Creator: NVD / NIST
Published: 2021-10-08T15:15:09.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.25%

Last modified Jun 17, 2026

CVE-2021-3312 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An XML external entity (XXE) vulnerability in Alkacon OpenCms 11.0, 11.0.1 and 11.0.2 allows remote authenticated users with edit privileges to exfiltrate files from the server's file system by uploading a crafted SVG document.. EPSS estimates a 1.25% chance of exploitation in the next 30 days.

Description

An XML external entity (XXE) vulnerability in Alkacon OpenCms 11.0, 11.0.1 and 11.0.2 allows remote authenticated users with edit privileges to exfiltrate files from the server's file system by uploading a crafted SVG document.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.25%

65.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Alkacon	Opencms	11.0
Alkacon	Opencms	11.0.1
Alkacon	Opencms	11.0.2

References

https://github.com/alkacon/opencms-core/issues/725Exploit, Issue Tracking, Third Party Advisory
https://github.com/alkacon/opencms-core/releasesRelease Notes, Third Party Advisory
https://github.com/alkacon/opencms-core/issues/725Exploit, Issue Tracking, Third Party Advisory
https://github.com/alkacon/opencms-core/releasesRelease Notes, Third Party Advisory

Timeline

Published: Oct 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3312?

How severe is CVE-2021-3312?

CVE-2021-3312 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3312?

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-2021-3312?

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

Scan your code now

Source: NVD / NIST