CVE-2021-43463: An Unquoted Service Path vulnerability exists in Ext2Fsd v0.68 via a specially crafted file in the Ext2Srv Ser

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HIGH 7.8DOWNGRADE

CVE-2021-43463 is a high-severity flaw (CVSS 7.8) affecting ext2 file system driver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Unquoted Service Path vulnerability exists in Ext2Fsd v0.68 via a specially crafted file in the Ext2Srv Service executable service path.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-428
Published	2022-04-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ext2 file system driver project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-04 16:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

ext2 file system driver project ext2 file system driver DOWNGRADE

Affected: 0.68

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.68

1. Check installed version

apt-cache policy ext2-file-system-driver || rpm -q ext2-file-system-driver || ext2-file-system-driver --version

2. No fixed release: DOWNGRADE to a release before 0.68 (Debian / Ubuntu)

apt-cache madison ext2-file-system-driver sudo apt install ext2-file-system-driver=<VERSION_BEFORE_0.68> sudo apt-mark hold ext2-file-system-driver

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ext2-file-system-driver sudo dnf downgrade ext2-file-system-driver-<VERSION_BEFORE_0.68> sudo dnf versionlock add ext2-file-system-driver

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-43463?

ext2 file system driver: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-43463 being exploited?

CVE-2021-43463 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-43463 affect?

CVE-2021-43463 affects ext2 file system driver. Severity is high (CVSS 7.8). An Unquoted Service Path vulnerability exists in Ext2Fsd v0.68 via a specially crafted file in the Ext2Srv Service executable service path.

How urgent is CVE-2021-43463?

Priority 42/100. High severity; Public exploit reference

References

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