CVE-2021-21871

Name: CVE-2021-21871
Creator: NVD / NIST
Published: 2021-06-29T16:15:08.393+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.95%

Last modified Jun 17, 2026

CVE-2021-21871 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A memory corruption vulnerability exists in the DMG File Format Handler functionality of PowerISO 7.9. A specially crafted DMG file can lead to an out-of-bounds write. EPSS estimates a 0.95% chance of exploitation in the next 30 days.

Description

A memory corruption vulnerability exists in the DMG File Format Handler functionality of PowerISO 7.9. A specially crafted DMG file can lead to an out-of-bounds write. An attacker can provide a malicious file to trigger this vulnerability. The vendor fixed it in a bug-release of the current version.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.95%

56.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Poweriso	Poweriso	7.9

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1308Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1308Exploit, Third Party Advisory

Timeline

Published: Jun 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21871?

How severe is CVE-2021-21871?

CVE-2021-21871 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.95% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21871?

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-2021-21871?

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

Scan your code now

Source: NVD / NIST