Security readout for executives and security teams
Plain-English summary
This flaw means some Comcast-supplied gateway firmware could send administration session cookies without the browser-only HTTPS protection flag. If those cookies travel over HTTP and an attacker can intercept the traffic, the attacker may be able to capture them and misuse the admin session.
Executive priority
Treat this as an inventory and hygiene issue unless affected gateways are confirmed in use. There is no cited active exploitation, but session-cookie exposure on network devices can become business-relevant if administrative access is reachable or traffic is observable.
Technical view
CVE-2017-9491 affects listed Comcast firmware builds on Cisco DPC3939, DPC3939B, DPC3941T, and Arris TG1682G devices. The administration application does not set the Secure cookie flag during HTTPS sessions, increasing risk of cookie disclosure if transmitted during HTTP traffic.
Likely exposure
Exposure is limited to the specific Comcast firmware and gateway models named in the CVE. Risk is most relevant where the administration application is used and network traffic could be intercepted. The source bundle provides no general CPE mapping or broader product list.
Exploitation context
The CVE describes a remote attacker capturing cookies by intercepting HTTP transmission. The provided sources do not show active exploitation, public weaponization, KEV listing, CVSS scoring, or confirmed exploitation in the wild.
Researcher notes
Evidence is sparse: the bundle includes the CVE description and Bastille advisory reference, but no CVSS, CWE, patch version, or exploit-status details. Do not generalize beyond the listed Comcast firmware builds and gateway models without vendor confirmation.
Mitigation direction
- Check Comcast, Cisco, or Arris guidance for firmware updates or replacement options.
- Restrict access to gateway administration interfaces to trusted networks.
- Avoid administering affected devices where traffic could be observed by untrusted parties.
- Replace affected unsupported gateways if patched firmware is unavailable.
- Review administrative sessions and credentials if cookie exposure is suspected.
Validation and detection
- Inventory gateways for the exact models and firmware versions named in the CVE.
- Inspect administration session cookies for the Secure attribute during HTTPS use.
- Confirm whether vendor firmware newer than the listed builds addresses the issue.
- Review network paths where device administration traffic could traverse HTTP.
- Document affected assets and remediation status for vulnerability management tracking.
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-2017-9491 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/BastilleResearch/CableTap/blob/master/doc/advisories/bastille-35.improper-cookie-flags.txtCVE 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.