Security readout for executives and security teams
Plain-English summary
CVE-2021-1485 affects Cisco IOS XR Software. A logged-in local user could submit crafted CLI input that runs commands as root on the device’s underlying Linux OS. Business risk is highest where many users have router CLI access or where privileged network devices are shared operationally.
Executive priority
Treat as moderate priority. It is not internet-scale unauthenticated risk, but compromise of core routing infrastructure by an authenticated user can materially affect network integrity and operations.
Technical view
The issue is insufficient CLI input validation in Cisco IOS XR Software, classified as CWE-88. Exploitation requires local access and low privileges, with no user interaction. Successful exploitation can execute arbitrary OS commands with root privileges, causing high integrity impact plus limited confidentiality and availability impact.
Likely exposure
Exposure is limited to Cisco IOS XR devices where an attacker can authenticate locally and access the affected CLI command. The source bundle does not provide affected release ranges or CPEs, so version confirmation requires Cisco advisory review.
Exploitation context
The provided sources do not show known active exploitation, and this CVE is not marked KEV. Exploitation is not unauthenticated remote compromise; it depends on a valid local authenticated user reaching the vulnerable CLI path.
Researcher notes
CVSS 3.1 score is 6.6: AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L. The bundle identifies Cisco IOS XR Software but does not include fixed versions, vulnerable commands, or exploit evidence. Avoid assuming broader Cisco product exposure.
Mitigation direction
- Review Cisco’s advisory for affected releases, fixed software, and workarounds.
- Inventory all Cisco IOS XR devices and owners.
- Restrict CLI access to necessary trusted administrators only.
- Remove stale local accounts and unnecessary operational privileges.
- Increase monitoring for unusual CLI and privilege activity.
Validation and detection
- Confirm each IOS XR device release against Cisco advisory guidance.
- Review AAA records for users with local CLI access.
- Check whether shared or dormant accounts can access affected devices.
- Review device logs for unexpected CLI usage or OS-level activity.
- Track remediation status per device and business owner.
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-88: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-1485 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
- Medium
- CVSS
- 6.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L1.84.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.6MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20210407 Cisco IOS XR Software Command Injection 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 Neutralization of Argument Delimiters in a Command ('Argument Injection')
Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.