Security readout for executives and security teams
Plain-English summary
Machform versions before 16 can be abused to redirect users from a legitimate Machform URL to another site through a poorly sanitized parameter. The main business concern is phishing or brand abuse, not direct system takeover based on the provided evidence.
Executive priority
Treat this as a near-term web application hygiene issue. It is not evidenced as actively exploited or system-compromising, but public-facing vulnerable instances can create credible phishing risk using the organization’s own domain.
Technical view
CVE-2021-20105 describes an open redirect in AppNitro Machform before version 16. The issue is in Safari_init.php and involves improper sanitization of the ref parameter. The source bundle provides no CVSS score, CWE mapping, or detailed vendor mitigation beyond the Machform 16 release reference.
Likely exposure
Organizations are likely exposed if they operate AppNitro Machform older than version 16, especially on public-facing form portals. Exposure depends on whether the affected Safari_init.php path and ref parameter are reachable in the deployed instance.
Exploitation context
The CVE is not listed in KEV, and the provided sources do not claim active exploitation. Open redirects can support phishing by making malicious destinations appear to originate from a trusted domain, but no weaponized details are provided here.
Researcher notes
Evidence is limited to the CVE description and reference bundle. No CVSS, CWE, exploit status, or patch details are included except that versions before 16 are affected and Machform 16 is referenced.
Mitigation direction
- Upgrade AppNitro Machform to version 16 or later where applicable.
- Check AppNitro vendor guidance for the exact fixed release and upgrade notes.
- Restrict or retire public access to outdated Machform instances until upgraded.
- Monitor web logs for suspicious redirect-like ref parameter usage.
Validation and detection
- Inventory all Machform deployments and confirm their installed version.
- Verify whether any public instance is running a version before 16.
- Confirm Safari_init.php is not reachable on retired or upgraded systems.
- Review logs for unusual ref parameter destinations or phishing reports.
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.
CVE-2021-20105 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
- 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://www.tenable.com/security/research/tra-2021-25%2Chttps://www.machform.com/blog-machform-16-released/CVE 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.