Security readout for executives and security teams
Plain-English summary
This flaw could let a signed-in local user on an affected Cisco IOS XE device get unrestricted root shell access after shell access has been enabled. That changes the risk from limited device access to full control of the operating environment. The bundle does not provide affected release ranges, CVSS, or confirmed fixed versions.
Executive priority
Treat this as a high-priority infrastructure control issue if Cisco IOS XE is in use. The business concern is full device-level compromise by someone who already has local authenticated access, especially where network devices support critical routing, segmentation, or customer connectivity.
Technical view
CVE-2018-15371 is an authentication bypass in Cisco IOS XE Software's shell access request mechanism. Insufficient authentication for certain commands could let an authenticated local attacker bypass authentication and obtain unrestricted root shell access, but only after the shell access feature is enabled.
Likely exposure
Exposure is most likely on Cisco IOS XE devices where local authenticated access exists and shell access has been enabled. The source bundle does not identify specific versions, platforms, or CPEs, so asset owners must map exposure using Cisco's advisory and device inventory.
Exploitation context
The bundle does not show CISA KEV listing or any cited evidence of active exploitation. Exploitation requires authenticated local access and the shell access feature being enabled, which reduces internet-scale exposure but raises insider, stolen-credential, and misconfigured-admin-access risk.
Researcher notes
Evidence is limited to the CVE description and Cisco advisory reference in the source bundle. No affected version matrix, CVSS vector, exploit confirmation, or patch details are included here. Avoid assuming remote exploitability; the described attacker is authenticated and local.
Mitigation direction
- Review Cisco's advisory for affected releases, fixed software, and workarounds.
- Inventory Cisco IOS XE devices and prioritize those with shell access enabled.
- Limit local administrative access to trusted operators only.
- Monitor device logs for unexpected shell access requests or privilege changes.
- Check Cisco TAC or official guidance if version impact is unclear.
Validation and detection
- Identify Cisco IOS XE devices in production, lab, and managed customer environments.
- Confirm whether shell access is enabled on each device.
- Compare running software versions against Cisco's official advisory guidance.
- Review administrative access paths for unnecessary local accounts or shared credentials.
- Check logs for unusual shell access requests by authenticated users.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupCredential 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.
Open ATT&CK lookupCVE-2018-15371 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
- 20180926 Cisco IOS XE Software Shell Access Authentication Bypass VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
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 Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.