Security readout for executives and security teams
Plain-English summary
This flaw affects Accusoft ImageGear 19.10 when it parses certain TIFF YCbCr images. A malicious file can corrupt memory and may allow remote code execution in the process handling the file.
Executive priority
Treat as urgent where ImageGear processes externally supplied images. Prioritize internet-facing upload paths and automated document pipelines because successful exploitation could compromise the parsing service.
Technical view
The source describes an out-of-bounds write in the TIFF YCbCr image parser in Accusoft ImageGear 19.10, classified as CWE-122. CVSS 3.0 is 9.8, with network attack vector, low complexity, no privileges, and no user interaction.
Likely exposure
Exposure is most likely in applications or services that embed Accusoft ImageGear 19.10 and process TIFF files from users, partners, email, document workflows, or automated ingestion pipelines.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. It does show a public Talos report and states a specially crafted file can trigger remote code execution.
Researcher notes
Evidence is limited to CVE metadata and the Talos reference in the bundle. Do not broaden affected versions beyond ImageGear 19.10 without vendor confirmation.
Mitigation direction
- Inventory applications and vendors using Accusoft ImageGear.
- Confirm whether ImageGear version 19.10 is present.
- Check Accusoft guidance for fixed versions or mitigations.
- Restrict TIFF processing from untrusted sources until remediated.
- Run image parsing in isolated, least-privileged environments.
- Monitor parsing services for crashes or abnormal child processes.
Validation and detection
- Search SBOMs and dependency records for Accusoft ImageGear.
- Inspect image-processing services for TIFF upload or ingestion paths.
- Verify deployed ImageGear versions against 19.10 exposure.
- Review vendor advisories before changing production controls.
- Test only with approved benign validation files or vendor checks.
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
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-21942 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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-2021-1371CVE 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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.