CVE-2021-42739

Name: CVE-2021-42739
Creator: NVD / NIST
Published: 2021-10-20T07:15:09.14+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2021-42739 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. The firewire subsystem in the Linux kernel through 5.14.13 has a buffer overflow related to drivers/media/firewire/firedtv-avc.c and drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandles bounds checking.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

The firewire subsystem in the Linux kernel through 5.14.13 has a buffer overflow related to drivers/media/firewire/firedtv-avc.c and drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandles bounds checking.

Metrics

CVSS 3.1

6.7/10

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

EPSS Probability

0.44%

35.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	<= 5.14.13	—
Fedoraproject	Fedora	33	—
Fedoraproject	Fedora	34	—
Fedoraproject	Fedora	35	—
Debian	Debian Linux	9.0	—
Starwindsoftware	Starwind San \& Nas	v8r12	—
Starwindsoftware	Starwind Virtual San	v8r13	14338
Oracle	Communications Cloud Native Core Binding Support Function	22.1.3	—
Oracle	Communications Cloud Native Core Network Exposure Function	22.1.1	—
Oracle	Communications Cloud Native Core Policy	22.2.0	—

References

https://bugzilla.redhat.com/show_bug.cgi?id=1951739Issue Tracking, Mitigation, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=35d2969ea3c7d32aee78066b1f3cf61a0d935a4e
https://lore.kernel.org/linux-media/YHaulytonFcW+lyZ%40mwanda/
https://seclists.org/oss-sec/2021/q2/46
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
https://www.starwindsoftware.com/security/sw-20220804-0001/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1951739Issue Tracking, Mitigation, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=35d2969ea3c7d32aee78066b1f3cf61a0d935a4e
https://lore.kernel.org/linux-media/YHaulytonFcW+lyZ%40mwanda/
https://seclists.org/oss-sec/2021/q2/46
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
https://www.starwindsoftware.com/security/sw-20220804-0001/Third Party Advisory

Timeline

Published: Oct 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42739?

How severe is CVE-2021-42739?

CVE-2021-42739 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42739?

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-2021-42739?

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

Scan your code now

Source: NVD / NIST