Is CVE-2021-42739 actively exploited?

No active exploitation of CVE-2021-42739 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-42739 be exploited remotely?

No. CVE-2021-42739 requires local access to exploit.

What is the CVSS score of CVE-2021-42739?

CVE-2021-42739 has a CVSS score of 6.7 (MEDIUM).

HOME VULNERABILITIESCVE-2021-42739

MEDIUM

CVE-2021-42739

CWE-787Published: October 20, 2021· Updated: Jun 17, 2026

6.7

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-42739 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.7.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges Req.High

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected Vendors & Products

Debian1 product(s)

debian linux

Fedora1 product(s)

fedora

Linux1 product(s)

linux kernel

Oracle3 product(s)

communications cloud native core binding support functioncommunications cloud native core network exposure functioncommunications cloud native core policy

starwindsoftware2 product(s)

starwind san \& nasstarwind virtual san

Source: NVD CPE · 10 total CPE entries