Security readout for executives and security teams
Plain-English summary
CVE-2021-31702 is an availability issue in Frontier iChris through 5.18. The CVE says the application mishandles DNS requests derived from the HTTP Host header, which can contribute to denial of service. The sources do not indicate data theft, privilege escalation, active exploitation, CVSS scoring, or a named vendor patch.
Executive priority
Prioritize asset discovery and exposure reduction. Because severity and fix data are incomplete, this should be handled as an availability risk requiring vendor confirmation, not as a confirmed emergency unless the service is internet-facing or business-critical.
Technical view
The reported weakness involves iChris making DNS requests based on the hostname supplied in the HTTP Host header. The CVE description says repeated hostile Host header values can demonstrate denial of service. Public metadata is sparse, with no CWE, CVSS vector, complete affected CPEs, or remediation details provided.
Likely exposure
Likely exposure is limited to organizations running Frontier iChris through version 5.18, especially if the web application is reachable by untrusted users. The source bundle does not provide CPEs, deployment details, or confirmation of later affected versions.
Exploitation context
A public GitHub reference exists for this CVE, but the source bundle does not include KEV listing or other evidence of active exploitation. Treat exploitation status as unconfirmed. The described impact is denial of service through Host header-related DNS behavior.
Researcher notes
Evidence is limited. The CVE text names Frontier iChris through 5.18, while the affected product metadata in the bundle is incomplete. No CVSS, CWE, CPE, KEV status, or official remediation is provided. Avoid assuming broader affected versions or confirmed exploitation.
Mitigation direction
- Identify whether Frontier iChris through 5.18 is deployed or externally reachable.
- Check Frontier vendor guidance for supported fixes or upgrade direction.
- Restrict iChris access to trusted networks where business operations allow.
- Review proxy or edge controls for strict Host header validation.
- Monitor for abnormal DNS lookups and repeated malformed Host header traffic.
Validation and detection
- Confirm product name and version from asset inventory or application administration records.
- Review web access logs for unusual Host header patterns targeting iChris.
- Check DNS resolver logs for unexpected lookup spikes tied to the application.
- Verify edge proxy configuration rejects unapproved hostnames.
- Document whether iChris is internet-facing, VPN-only, or internal-only.
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-2021-31702 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://github.com/l00neyhacker/CVE-2021-31702CVE 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.