CVE-2021-33637: When the isula export command is used to export a container to an image and the container is controlled by an

Routine

HIGH 8.4DOWNGRADE

CVE-2021-33637 is a high-severity flaw (CVSS 8.4) affecting isula. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

When the isula export command is used to export a container to an image and the container is controlled by an attacker, the attacker can escape the container.

Why this priority

High severity

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

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-665
Published	2023-10-29
Last modified	2026-06-17

Publisher (CNA): openEuler · Vendor: openeuler

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

Am I affected?

Timeline

2023-10-29 08:15 UTCPublished CVE record published
2026-06-17 03:54 UTCUpdated Record last modified

openeuler isula DOWNGRADE

Affected: 2.0.8-20210518.144540 · 2.0.18-10 · 2.1.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.8-20210518.144540

1. Check installed version

apt-cache policy isula || rpm -q isula || isula --version

2. No fixed release: DOWNGRADE to a release before 2.0.8-20210518.144540 (Debian / Ubuntu)

apt-cache madison isula sudo apt install isula=<VERSION_BEFORE_2.0.8-20210518.144540> sudo apt-mark hold isula

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

dnf --showduplicates list isula sudo dnf downgrade isula-<VERSION_BEFORE_2.0.8-20210518.144540> sudo dnf versionlock add isula

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-2021-33637?

isula: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-33637 being exploited?

CVE-2021-33637 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-2021-33637 affect?

CVE-2021-33637 affects isula. Severity is high (CVSS 8.4). When the isula export command is used to export a container to an image and the container is controlled by an attacker, the attacker can escape the container.

How urgent is CVE-2021-33637?

Priority 32/100. High severity

Related CVEs

CVE-2021-33638 HIGH 8.4 DOWNGRADE When the isula cp command is used to copy files from a container to a host machine and the container is contr
CVE-2021-33636 HIGH 8.4 DOWNGRADE When the isula load command is used to load malicious images, attackers can execute arbitrary code.
CVE-2021-33635 CRITICAL 9.8 DOWNGRADE When malicious images are pulled by isula pull, attackers can execute arbitrary code.

References

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