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CVE-2018-10990: On Arris Touchstone Telephony Gateway TG1682G 9.1.103J6 devices, a logout action does not immediately destr...

On Arris Touchstone Telephony Gateway TG1682G 9.1.103J6 devices, a logout action does not immediately destroy all state on the device related to the validity of the "credential" cookie, which might make it easier for attackers to obtain access at a later time (e.g., "at least for a few minutes"). NOTE: there is no documentation stating that the web UI's logout feature was supposed to do anything beyond removing the cookie from one instance of a web browser; a client-side logout action is often not intended to address cases where a person has made a copy of a cookie outside of a browser.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This CVE describes a weak logout behavior in the web interface of Arris Touchstone Telephony Gateway TG1682G 9.1.103J6 devices. Logging out may remove the cookie from one browser but may not immediately invalidate a copied credential cookie, leaving a short window for later access if that cookie was already captured.

Executive priority

Moderate operational priority where these gateways are still deployed. The issue is narrow and evidence is incomplete, but affected devices should be inventoried and managed through vendor or ISP guidance.

Technical view

The issue concerns residual validity of the TG1682G web UI credential cookie after logout. The CVE notes validity may persist for at least a few minutes, but also cautions that the logout feature may only have been intended to remove the browser cookie, not invalidate copied cookies server-side.

Likely exposure

Exposure appears limited to environments using Arris Touchstone TG1682G firmware 9.1.103J6 where an attacker can obtain an authenticated web UI cookie and reach the device interface.

Exploitation context

The provided sources do not show active exploitation, KEV listing, CVSS scoring, or a public vendor fix. Risk depends on prior cookie access and interface reachability, not unauthenticated remote compromise.

Researcher notes

The CVE record includes an important caveat: logout may not have been documented as server-side session invalidation. Avoid overstating this as a confirmed authentication bypass; focus analysis on cookie persistence, device version, and administrative interface exposure.

Mitigation direction

  • Check Arris or ISP guidance for firmware, replacement, or configuration recommendations.
  • Restrict gateway administrative interface access to trusted local networks only.
  • Avoid administering the device from shared or untrusted browsers.
  • Treat logout as insufficient protection if a session cookie may have been exposed.
  • Rotate administrative credentials after suspected session exposure.

Validation and detection

  • Inventory for Arris Touchstone TG1682G devices running 9.1.103J6.
  • Confirm whether the web UI is reachable from untrusted networks.
  • Review vendor or ISP notices for this exact device and firmware.
  • Validate session invalidation behavior only in an authorized lab setting.
  • Assess whether administrative access uses shared machines or unmanaged browsers.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2018-10990 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.