Security readout for executives and security teams
Plain-English summary
iccDEV versions before 2.3.1.1 contain an undefined-behavior flaw in code that initializes CLUT data for ICC color profiles. If an organization uses iccDEV to process ICC profiles, crafted input could cause serious security impact. The published CVSS score is high, but user interaction is required and no active exploitation is indicated by KEV.
Executive priority
Treat as a high-priority dependency update for teams handling images, print, design, or color-management workflows. Business urgency is highest where external ICC profiles are processed. No source confirms active exploitation, so prioritize based on exposure rather than emergency incident response.
Technical view
CVE-2026-21677 affects International Color Consortium iccDEV before 2.3.1.1. The flaw is in CIccCLUT::Init(), which initializes and sizes a CLUT. The record maps to CWE-20 and CWE-758. CVSS 3.1 is 8.8 with AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The vendor advisory states the issue is fixed in 2.3.1.1.
Likely exposure
Exposure is most likely in applications, services, or internal tools that include iccDEV and process ICC color profiles, especially profiles supplied by users, partners, or external content workflows. Systems not using iccDEV, or already updated to 2.3.1.1 or later, are not indicated as affected by the provided sources.
Exploitation context
The CVSS vector indicates network reachability, low attack complexity, no privileges required, and required user interaction. The sources do not show CISA KEV listing or active exploitation. Public references include a GitHub advisory, issue, and fixing commit, but the provided bundle does not establish real-world exploitation.
Researcher notes
Key unknowns are downstream adoption and reachable parsing paths. Validate whether CIccCLUT::Init() is reachable from exposed ICC profile processing in your environment. Avoid assuming exploitability beyond the advisory and CVSS; the provided sources establish affected versions, impact rating, and fixed release.
Mitigation direction
- Upgrade iccDEV to version 2.3.1.1 or later.
- Identify products and internal builds that bundle iccDEV.
- Prioritize systems processing externally supplied ICC profiles.
- If upgrade timing is unclear, check the GitHub advisory for vendor guidance.
- Track downstream vendor updates for software that embeds iccDEV.
Validation and detection
- Confirm deployed iccDEV versions are 2.3.1.1 or later.
- Review SBOMs and dependency manifests for iccDEV usage.
- Check packaged applications for bundled vulnerable iccDEV code.
- Verify the fixing commit or release is present in source builds.
- Document whether ICC profile processing accepts external input.
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-20: 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 lookupCWE-758: 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-2026-21677 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-95w5-jvqf-3994CVE reference · x_refsource_CONFIRM
- https://github.com/InternationalColorConsortium/iccDEV/issues/181CVE reference · x_refsource_MISC
- https://github.com/InternationalColorConsortium/iccDEV/commit/201125fbda22c8e4ea95800a6b427093fa4b8a22CVE 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
Reliance on Undefined, Unspecified, or Implementation-Defined Behavior represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.