Security readout for executives and security teams
Plain-English summary
CVE-2021-21945 is a critical memory corruption flaw in Accusoft ImageGear 19.10 when parsing TIFF files. A malicious file can trigger heap buffer overflow behavior. Businesses are most exposed where ImageGear processes untrusted images or documents, especially through automated upload or conversion workflows.
Executive priority
Treat this as urgent where ImageGear 19.10 handles external files. The risk is lower if the product is absent or only processes trusted internal files, but validation should happen quickly because the CVSS rating is critical.
Technical view
The CVE describes two heap-based buffer overflow vulnerabilities in ImageGear 19.10 TIFF parsing, classified as CWE-122. The CVSS 3.0 score is 9.8 with network attack vector, low complexity, no privileges, and no user interaction. The provided evidence identifies malicious file processing as the trigger but does not name a patch version.
Likely exposure
Exposure is limited to deployments using Accusoft ImageGear 19.10, especially services that accept or process TIFF files from users, partners, email, web uploads, or document pipelines.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. It supports a malicious-file trigger and critical CVSS impact, but not confirmed exploitation in the wild.
Researcher notes
The bundle identifies TIFF parser heap overflow behavior and a specific affected version, but provides limited remediation detail. Do not assume broader ImageGear versions are affected without vendor evidence. Absence from KEV means active exploitation is not established here.
Mitigation direction
- Identify any Accusoft ImageGear 19.10 deployments or embedded uses.
- Check Accusoft and Talos guidance for fixed versions or vendor mitigations.
- Restrict TIFF processing from untrusted sources where practical.
- Add file validation and sandboxing around image conversion workflows.
- Prioritize upgrade or isolation for internet-facing ingestion services.
Validation and detection
- Inventory applications and services using Accusoft ImageGear.
- Confirm deployed ImageGear version numbers against 19.10.
- Review upload, email, and conversion paths for TIFF handling.
- Search logs for crashes during TIFF parsing or conversion.
- Verify vendor remediation status before closing the finding.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-122: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-21945 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1374CVE 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.