How severe is CVE-2021-33637?

CVE-2021-33637 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33637 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33637?

CVE-2021-33637 primarily affects Openeuler Isula. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33637?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-33637 published?

CVE-2021-33637 was published on 2023-10-29 and last updated on 2026-06-17.

CVE-2021-33637

CVE-2021-33637 is a high-severity vulnerability in Openeuler Isula with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-665.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-665
Affected product: Openeuler Isula
Published: 2023-10-29
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-33637?: 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 severe is CVE-2021-33637?: CVE-2021-33637 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33637 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33637?: CVE-2021-33637 primarily affects Openeuler Isula. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33637?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-33637 published?: CVE-2021-33637 was published on 2023-10-29 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:openeuler:isula:2.0.8-20210518.144540:*:*:*:*:*:*:*
cpe:2.3:a:openeuler:isula:2.0.18-10:*:*:*:*:*:*:*
cpe:2.3:a:openeuler:isula:2.1.2:*:*:*:*:*:*:*

More vulnerabilities in Openeuler Isula

CVE-2021-33635 — Critical (CVSS 9.8): When malicious images are pulled by isula pull, attackers can execute arbitrary code.
CVE-2021-33638 — High (CVSS 8.4): When the isula cp command is used to copy files from a container to a host machine and the container is controlled by…
CVE-2021-33636 — High (CVSS 8.4): When the isula load command is used to load malicious images, attackers can execute arbitrary code.

All CVEs affecting Openeuler Isula →

Other CWE-665 (Improper Initialization) vulnerabilities

CVE-2021-33635 — Critical (CVSS 9.8): When malicious images are pulled by isula pull, attackers can execute arbitrary code.
CVE-2022-37128 — Critical (CVSS 9.8): In D-Link DIR-816 A2_v1.10CNB04.img the network can be initialized without authentication via /goform/wizard_end.
CVE-2021-41264 — Critical (CVSS 9.8): OpenZeppelin Contracts is a library for smart contract development. In affected versions upgradeable contracts using…
CVE-2019-10196 — Critical (CVSS 9.8): A flaw was found in http-proxy-agent, prior to version 2.1.0. It was discovered http-proxy-agent passes an auth option…
CVE-2015-8367 — Critical (CVSS 9.8): The phase_one_correct function in Libraw before 0.17.1 allows attackers to cause memory errors and possibly execute…
CVE-2019-14271 — Critical (CVSS 9.8): In Docker 19.03.x before 19.03.1 linked against the GNU C Library (aka glibc), code injection can occur when the…

Browse all CWE-665 (Improper Initialization) vulnerabilities →