Security readout for executives and security teams
Plain-English summary
CVE-2021-21824 is a high-severity memory corruption flaw in Accusoft ImageGear 19.9 when handling certain JPG/JPEG420 files. An attacker could supply a malformed image to an application that processes it, potentially affecting confidentiality, integrity, and availability.
Executive priority
Treat this as a high-priority dependency exposure where ImageGear 19.9 processes untrusted images, especially internet-facing upload or conversion services. Urgency is lower where ImageGear is absent or only handles trusted files.
Technical view
The flaw is an out-of-bounds write in ImageGear 19.9 JPG Handle_JPEG420 functionality, associated with CWE-131. The CVSS 3.0 score is 8.1 with high impact across confidentiality, integrity, and availability, but high attack complexity.
Likely exposure
Exposure is most likely in applications, services, or workflows that use Accusoft ImageGear 19.9 to ingest, convert, preview, or analyze JPG files from untrusted sources.
Exploitation context
The provided sources say a specially crafted malformed file can trigger memory corruption. They do not show CISA KEV listing, active exploitation, public weaponization, or affected versions beyond ImageGear 19.9.
Researcher notes
Focus validation on version confirmation and data-flow analysis, not proof-of-concept reproduction. The available evidence supports memory corruption via malformed JPG handling, but does not establish exploit-in-the-wild status or a specific patch level.
Mitigation direction
- Inventory applications using Accusoft ImageGear 19.9.
- Check Accusoft and Talos guidance for fixed versions or vendor mitigations.
- Prioritize upgrading or removing affected ImageGear deployments where confirmed.
- Restrict untrusted JPG processing in exposed upload and conversion paths.
- Run image parsing workloads with least privilege and process isolation.
- Monitor for crashes or abnormal behavior in image-processing services.
Validation and detection
- Confirm ImageGear version in deployed applications and build artifacts.
- Map all routes and jobs that process user-supplied JPG files.
- Review crash logs for faults in JPG or ImageGear processing paths.
- Verify any upgrade or mitigation against vendor documentation.
- Test normal image workflows after remediation to catch regressions.
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-131: 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 lookupCVE-2021-21824 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
- High
- CVSS
- 8.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/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:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.1HighVector: CVSS:3.0/AV:N/AC:H/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-2021-1289CVE 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.