Security readout for executives and security teams
Plain-English summary
This issue affects Cisco 800 Series Industrial Integrated Services Routers running Cisco IOS Software. A logged-in local attacker could use unintended internal test commands to write data into device memory. That can threaten router reliability and integrity, but the available source bundle does not show remote unauthenticated exploitation or active exploitation.
Executive priority
Prioritize assessment where these routers support industrial, remote, or safety-sensitive operations. The vulnerability requires local authenticated access, so urgency depends on account control and physical or console access exposure.
Technical view
CVE-2018-15376 is a CWE-123 arbitrary memory write in the embedded test subsystem of Cisco IOS Software for Cisco 800 Series Industrial Integrated Services Routers. Certain development-only test commands were present in affected software. An authenticated local attacker could use them to write arbitrary values to arbitrary memory locations on the device.
Likely exposure
Exposure is most likely in organizations operating Cisco 800 Series Industrial Integrated Services Routers, especially industrial or remote sites where local authenticated CLI access is available to administrators, contractors, or compromised accounts. The bundle does not identify exact affected versions.
Exploitation context
The provided evidence describes exploitation by an authenticated local attacker using unintended test commands. KEV is false in the source bundle, and no cited source states active exploitation. Treat exploitation status as not publicly confirmed from these sources.
Researcher notes
Key evidence gaps remain: the bundle does not provide CVSS, exact affected versions, fixed releases, or exploit observations. Analysis should stay anchored to Cisco’s advisory and CVE records, with no assumption of internet-scale exploitation.
Mitigation direction
- Identify Cisco 800 Series Industrial Integrated Services Routers in the environment.
- Check Cisco’s advisory for affected and fixed IOS releases.
- Restrict local and administrative access to trusted personnel only.
- Review and reduce privileged accounts on affected routers.
- Monitor administrative sessions for unusual test or debug command use.
Validation and detection
- Inventory router models and Cisco IOS versions.
- Compare versions against Cisco’s advisory details.
- Confirm whether local authenticated access is tightly controlled.
- Review device logs for unexpected administrative command activity.
- Document remediation status for each affected router.
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-123: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupCVE-2018-15376 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 Software for Cisco 800 Series Industrial Integrated Services Routers Arbitrary Memory Write VulnerabilitiesCVE 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.
Write-what-where Condition
Write-what-where Condition represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.