CVE-2021-33629Network attack vector

Builder crash via untrimmed RUN trailing spaces

Published Jul 26, 2021 · Updated Aug 3, 2024

Denial of service in openEuler isula-build before 0.9.5-6 allows remote attackers to crash isula-builder via a crafted Dockerfile. The Dockerfile RUN-instruction path leaves multiple trailing spaces in externally supplied build data instead of trimming them, and the malformed input triggers a panic. Reachability requires submission of a container-image build containing the crafted RUN line; the bounded consequence is interruption of the builder process.

CVSS severity7.5
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in openEuler isula-build before 0.9.5-6 allows remote attackers to crash isula-builder via a crafted Dockerfile. The Dockerfile RUN-instruction path leaves multiple trailing spaces in externally supplied build data instead of trimming them, and the malformed input triggers a panic. Reachability requires submission of a container-image build containing the crafted RUN line; the bounded consequence is interruption of the builder process.

The record

CVE
CVE-2021-33629
Published
Jul 26, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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