CVE-2021-25908: An issue was discovered in the fil-ocl crate through 2021-01-04 for Rust

This week

HIGH 7.5REMOTEUPGRADE

CVE-2021-25908 is a high-severity flaw (CVSS 7.5) affecting fil-ocl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in the fil-ocl crate through 2021-01-04 for Rust. From<EventList> can lead to a double free.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-415
Published	2021-01-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fil-ocl project

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

Am I affected?

Timeline

2021-01-26 18:16 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

fil-ocl project fil-ocl UPGRADE

Affected: >= 0.12.0 and <= 0.19.4

Fixed in: newer than 0.19.4

Safe to downgrade to: a release before 0.12.0

1. Check installed version

apt-cache policy fil-ocl || rpm -q fil-ocl || fil-ocl --version

2. UPGRADE to newer than 0.19.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fil-ocl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fil-ocl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.12.0 (Debian / Ubuntu)

apt-cache madison fil-ocl sudo apt install fil-ocl=<VERSION_BEFORE_0.12.0> sudo apt-mark hold fil-ocl

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list fil-ocl sudo dnf downgrade fil-ocl-<VERSION_BEFORE_0.12.0> sudo dnf versionlock add fil-ocl

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-2021-25908?

fil-ocl: upgrade to newer than 0.19.4. Exact commands for each OS are on this page.

Is CVE-2021-25908 being exploited?

CVE-2021-25908 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-2021-25908 affect?

CVE-2021-25908 affects fil-ocl. Severity is high (CVSS 7.5). An issue was discovered in the fil-ocl crate through 2021-01-04 for Rust. From<EventList> can lead to a double free.

How urgent is CVE-2021-25908?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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