CVE-2020-21522

Name: CVE-2020-21522
Creator: NVD / NIST
Published: 2020-09-30T18:15:23.88+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.53%

Last modified Jun 17, 2026

CVE-2020-21522 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in halo V1.1.3. A Zip Slip Directory Traversal Vulnerability in the backend,the attacker can overwrite some files, such as ftl files, .bashrc files in the user directory, and finally get the permissions of the operating system.. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

An issue was discovered in halo V1.1.3. A Zip Slip Directory Traversal Vulnerability in the backend,the attacker can overwrite some files, such as ftl files, .bashrc files in the user directory, and finally get the permissions of the operating system.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.53%

71.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Halo	Halo	1.1.3

References

https://github.com/halo-dev/halo/issues/418Exploit, Issue Tracking, Third Party Advisory
https://github.com/halo-dev/halo/issues/418Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Sep 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-21522?

How severe is CVE-2020-21522?

CVE-2020-21522 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2020-21522?

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-2020-21522?

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

Scan your code now

Source: NVD / NIST