Security readout for executives and security teams
Plain-English summary
This vulnerability can let activity through TYPO3’s file abstraction layer consume disk space under /var/transient, causing a denial of service. The sources identify the affected component as the deferred_image_processing extension before version 1.0.2, not TYPO3 core generally.
Executive priority
Treat this as a focused availability risk. Prioritize TYPO3 sites using the named extension, especially public or high-traffic properties where disk exhaustion could affect customer-facing service.
Technical view
CVE-2021-38623 is a denial-of-service issue in the TYPO3 deferred_image_processing extension before 1.0.2. The described failure mode is uncontrolled transient disk consumption through the FAL API. No CVSS, CWE, detailed prerequisites, or proof of exploitation are provided in the supplied sources.
Likely exposure
Likely exposure is TYPO3 deployments that installed deferred_image_processing below 1.0.2. The source bundle does not identify affected TYPO3 core versions, CPEs, authentication requirements, or specific reachable endpoints.
Exploitation context
The CVE is not listed in KEV, and the supplied sources do not claim active exploitation. The risk is availability impact: disk exhaustion can disrupt image processing or broader site operations if transient storage fills.
Researcher notes
Evidence is sparse. The source bundle supports extension name, affected version threshold, DoS class, FAL API involvement, and /var/transient disk consumption. It does not provide exploit mechanics, authentication context, or environmental constraints.
Mitigation direction
- Inventory TYPO3 sites for the deferred_image_processing extension.
- Upgrade deferred_image_processing to version 1.0.2 or later.
- Review the TYPO3 advisory before applying production changes.
- Monitor /var/transient capacity and alert on abnormal growth.
- Restrict unnecessary access paths that trigger image processing.
Validation and detection
- Confirm installed deferred_image_processing versions across TYPO3 environments.
- Verify upgraded systems report version 1.0.2 or later.
- Check monitoring for /var/transient growth or disk pressure.
- Review logs for repeated FAL image-processing activity.
- Confirm no critical services share unprotected transient storage.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2021-38623 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://typo3.org/security/advisory/typo3-ext-sa-2021-009CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.