Security readout for executives and security teams
Plain-English summary
An attacker who already has local authenticated access to a Cisco IOS XE SD-WAN device could abuse the system CLI to run operating-system commands as root. That can mean full device compromise. The supplied sources do not describe this as remote or unauthenticated.
Executive priority
Treat as high priority where Cisco IOS XE SD-WAN is in use, especially on production routing or SD-WAN control paths. The attacker needs authenticated local access, but successful exploitation could give root-level control of the device.
Technical view
CVE-2021-1529 is a CWE-78 command injection flaw in the Cisco IOS XE SD-WAN Software CLI. Insufficient input validation allows crafted CLI input from an authenticated local attacker to execute arbitrary commands on the underlying OS with root privileges.
Likely exposure
Exposure is limited to environments running Cisco IOS XE SD-WAN Software. The supplied bundle does not identify affected version ranges, so teams must compare deployed releases against Cisco's advisory.
Exploitation context
The CVSS vector is local, low complexity, low privileges, no user interaction, with high confidentiality, integrity, and availability impact. The bundle says KEV is false and provides no cited evidence of active exploitation.
Researcher notes
Evidence supports authenticated local command injection through the system CLI. Affected versions and exact fixed releases are not present in the supplied bundle. Avoid assuming internet-scale exploitability without additional Cisco advisory detail or telemetry.
Mitigation direction
- Review Cisco's advisory for affected releases and fixed software guidance.
- Inventory Cisco IOS XE SD-WAN Software deployments.
- Restrict CLI access to authorized administrators only.
- Prioritize remediation on shared, high-trust, or internet-managed network devices.
- Monitor vendor guidance for updated mitigation or fixed-release details.
Validation and detection
- Confirm whether Cisco IOS XE SD-WAN Software is deployed.
- Map each deployment to its exact software release.
- Compare releases against Cisco's advisory.
- Review local administrator and CLI access paths.
- Check logs for unusual CLI activity 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-78: 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-2021-1529 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20211020 Cisco IOS XE SD-WAN 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 Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.